Rockler 29190 Clamp-It Assembly Square Tool
Woodworking Clamps: Align it, clamp it, and fasten it to get perfect 90° angles every time! The right angle clamp replaces custom clamping jigs, acts as a third hand, and eliminates the need for long bulky clamps.
Perfect 900 Corner: This 90 degree positioning square allows you to assemble a cabinet one corner at a time.