This 11/16" x 1-5/8" stretcher bar offers an economical option for most stretched canvases, and is strong enough to support frames up to 60" with bracing. The stretcher bar ends feature a special tongue and groove miter making it easy to assemble a frame. The joint design allows you to expand the frame if needed and re-tension loose canvases. Made from solid wood No need for staples or glue Adjustable design