Beautifully constructed wood frames tighten both directions with the "T" tool (345-263-0001). The framework is adjustable to compensate for fabric stretch in both directions with the adjustment mechanism fully enclosed in the stretcher bars. Only tack the project once as there is plenty of adjustment for most needlework projects. Easy to loosen fabric if needed for making bullion knots or for storage. The bars are marked at center points so you can easily find the center of your canvas or fabric. If you have arthritis or other joint, tendon or ligament problems, you will love these bars. See related products below for more sizes.