21x24 3D Professional 2.5" Deep K2 Stretcher Frame Kit

True 8:7 Near Square Proportion - 21x24 Size

The 8:7 aspect ratio has a subtle horizontal emphasis, providing a slight stretch that offers more width than height. This creates a composition that feels expansive without losing its compactness. The ratio works well for scenes that need a bit of extra breathing room horizontally, such as landscapes, wide portraits, or still life arrangements.

The near-square format adds a sense of balance, while the slight horizontal lean invites the viewer's eye to move side to side, offering gentle movement across the canvas. It’s an ideal choice when looking to create compositions that feel open yet grounded, with enough space to explore without overwhelming the viewer with too much width.

Explore other sizes in this same 8:7 aspect ratio:

105x120 • 14x16 • 28x32 • 35x40 • 42x48 • 49x56 • 56x64 • 63x72 • 70x80 • 77x88 • 84x96 • 91x104 • 98x112

3D™ Pro 2.5 Stretcher Bar • 1/2" Canvas Clearance

1/2" Canvas Clearance is the space between the Bar and the canvas. Generally speaking, more clearance reduces the risk of the canvas touching the wood and creating unsightly lines during painting. Our design provides the optimal clearance so as not to impact your painting, but still leaving enough wood to the maximize strength of the Stretcher Bar.

• Produces a 2.5" deep stretched canvas (Actual depth is slightly thinner)
• 1.25" wide Stretcher Bar
• All Bars have an exclusive groove on the inside perimeter of the frame to which cross braces and Diamond Corner Braces attach
• Solid Ponderosa Pine or Fir from the Pacific Northwest

Solid Wood is Archival - Finger Jointed Wood is Not

We only use Solid Wood to build our Stretcher Bars because a solid piece of wood will last indefinitely. When we speak of archival value, it's not just the paint you use and the quality of your canvas and ground, even the wood choices manufacturers make are part of the archival process.

The principal reason manufactures use finger jointed wood is reduce cost, not increase archival value. Wood constantly grows and shrinks when the environment becomes hotter, or colder, or more humid, or more dry. Because finger jointed wood is made-up of multiple and varied pieces of wood, with varying grain patterns and densities, they each absorb and shed moisture at varying rates, which works on the glue joints that hold them together, causing the wood to bow and the joints to eventually fail, and certainly not consistent with increasing the archival value of your artwork frame support.

As a manufacturer, we do our part to conserve as much wood as possible, and still provide a quality made product that will out-perform any other in the marketplace.

• Super strong 3D™ Pro K2™ Stretcher Bar is a very popular among contemporary artists whose painting will be displayed without a frame.
• For this 21x24 large size frame, the frame provides the ultimate foundation for your art with increased strength and stability
• Provides a 2.5" deep stretched canvas which makes a bold and commanding display
• 1-1/4" wide Stretcher Bars
• All Bars have an exclusive groove on the inside perimeter of the frame to which cross braces and Diamond Corner Braces attach
• Solid Ponderosa Pine or Fir from the Pacific Northwest

Sustainably Managed Forests Inhale and Exhale

The world's forests are essential to human survival. Forests inhale carbon dioxide for the earth, and exhale oxygen essential for life. When we speak of the sustainable forest strategy of ensuring that more timber will exist in the same forest land than exists today, this is the only viable plan for the future of humanity. For this reason, we use only lumber from the sustainable forests of Oregon, Washington, and California, where there’s more standing timber today than last century!

Specially Dried and Heat Treated Lumber

Our wood is handpicked from a curated group of environmentally responsible lumber mills in the Pacific Northwest. By adhering to our precise drying and heat-treatment standards, these mills produce lumber with nearly half the moisture you'd find in common home improvement outlets or lumber yards. This meticulous process not only enhances the wood's strength—minimizing risks of cracks, splits, or bends—but also elevates its dimensional stability. Such quality, despite its premium, is paramount in creating professional canvases designed to uphold the sanctity of your cherished art throughout the years.

29x32 is the Canvas Size Needed for this 21x24 Frame

Please note that you will need a canvas that is at least 8 Inches larger than the actual frame size to ensure proper stretching. This will provide ample material to stretch the canvas and attach it to the back of the frame. If you prefer to attach the canvas from the edge of the stretcher frame, you can reduce the size of your canvas by approximately 3/4" all the way around the frame. This will allow you to paint on the edge of the canvas and hang your artwork without needing a separate picture frame. And, if you ever need to remove the canvas from the frame and re-attach it, you'll have enough material to do that too.

With deep family ties and a legacy spanning since 1965 in California, Masterpiece® has been the epitome of unmatched quality in Stretcher Bars across North America. Our commitment to pioneering excellence has crowned us as the forerunners in the world of professional fine-art canvases. Bolstered by our patented innovations, our products exude a caliber that's in a league of its own. One touch, and the unparalleled quality becomes palpable, leaving an indelible impression on your clients and all future admirers of your art.

Geometry is the foundation of all painting. ♦ Albrecht Dürer

Albrecht Dürer, a pivotal figure in the Northern Renaissance, beautifully merged art and mathematics in his work, leading to groundbreaking advances in the world of printmaking and illustration. Born in Nuremberg in 1471, Dürer's penchant for detail was evident early on. His exquisite engravings and woodcuts displayed not only his artistic brilliance but also his analytical mind. For Dürer, the precise lines, shapes, and proportions governed by geometry were not constraints; instead, they were the very tools that breathed life into his masterpieces.

The essence of Dürer's statement about geometry and painting becomes especially palpable when observing his meticulous studies of nature, human anatomy, and perspective. His treatise on geometry and human proportion, Four Books on Measurement, stands as a testament to his merging the seemingly disparate worlds of art and mathematics. The genius of Dürer lay in his realization that the natural world, in all its beauty, follows geometric patterns, and capturing this essence was key to achieving realism and depth in art. Through his belief in the fundamental role of geometry, Dürer not only elevated his own craft but also paved the way for future artists to approach their work with a harmonious blend of artistic intuition and mathematical precision.

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We love fanning the flames of your artistic passion. Immerse yourself in the wisdom of this intriguing quote and context, and enjoy our own unique creation of this portrait of Albrecht Dürer. Paint your heart out!