FrameLok - a smart, simple tool to keep your frame square as you stitch! Secure your loose stretcher frames with FrameLok Helps stabilize your bars to keep them plumb as you stitch (tacks sold separately) FrameLoks help minimize the need for blocking Hold FrameLok bracket snugly in the inner frame corner. Then, secure Framelok by inserting a tack in the pre-drilled holes. Done! 3D Extruded of a strong filament that will last hundreds of uses FrameLoks are available in assorted colors of the rainbow Add your color preference(s) on your cart page, we do our best to accommodate Proudly crafted in the USA by Ian Hamilton, a needlepointer's son Can be used on both mini and regular width stretcher bars Bracket is 1 1/8" x 9/16" (1.4cm x 3cm) Package contains four (4) brackets, good for one canvas Simple, effective, reusable, and pretty!