Rockler"s Adjustable Clamp-It Assembly Square Tool aligns, clamps and fastens to give a perfect 90° angle every time! A solution that"s so simple, you"ll wonder why it took so long to develop! The exclusive Clamp-It square guarantees a 90° joint every time, replaces custom clamping jigs, acts as a third hand, and eliminates the need for long clamps! Simply put, the Clamp-It is a square you can clamp. It allows you to assemble any two pieces at 90°, and even lets you assemble a cabinet one corner at a time. It works with any joinery technique, from nails to hand cut dovetails. It is ideal for every stage of construction, from assembling plywood cabinets to face frames and drawers. Clamp-It is also perfect for framing decks and installing rails and balusters. Attach it to a work surface, and it becomes a right angle fixture for bench assembly. Clamp-It has been computer designed and manufactured from high impact, rigid polycarbonate to ensure strength and accuracy. It measures 8" x 8" x 1-1/2".