Masterpiece Elite Heavy Duty B2 Custom Stretcher Frame Kit 150cm by 210cm 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 3.8cm deep stretcher bars, and cross braces, corner supports, keys, glue and diamond braces, as needed per size, for added stability.