The patented B2 Heavy Duty Stretcher Kits from Masterpiece takes the hassle out of building a stretcher frame. This complete kit includes everything you need to construct the best frame on the market. Kits larger than 36" include braces, but sizes 36" and smaller do not. Canvas is not included. These kits include: - B2 Professional Heavy Duty 1-7/16" deep x 2-1/4" wide (4 cm x 6 cm) stretcher bars for maximum strength and support - Kits for sizes larger than 36" include solid wood keyable braces that are twice as large and twice as strong as most other braces - On sizes where the braces have a cross configuration, nails and glue are also included - Brace keys, corners, and diamond braces (on sizes where appropriate) - Corner keys (on all sizes)