Masterpiece Elite Heavy Duty B2 Custom Stretcher Frame Kit 40-Inch by 40-Inch is a Do-it-yourself-artist's dream come true. The Kit contains everything you need to construct the best frame on the market. The Bars are precisely milled, with a unique, patented inner groove that accepts braces wherever you want to place them. Double-wide, solid wood, keyable braces are twice as strong as competing systems. The kit includes 4 1-1/2-Inch deep stretcher bars, and cross braces, corner supports, keys, glue and diamond braces, as needed per size, for added stability.