Stretcher Bar Pair and Brace Kits are the ultimate solution for stretcher bars. Artists can now easily build their own cross-braced stretcher frame for any size! A properly stretched canvas puts enough stress on a stretcher bar to bow the bar inward, thereby creating an unsightly problem. Cross braces help keep the stretcher bars supported, straight, and help prevent the canvas from loosening due to bars bowing. Masterpiece has solved the problem by including a brace with every pair of bars. Because each brace slides into a groove of every bar, this allows the frame to be expanded. Instructions included with every label. Each Bar has a 2.5cm - 1.3cm . edge height, and 2.5cm - 1.6cm . width. Sold as PACK OF 2.