Bessey 90 Degree Angle Clamp. It holds and aligns materials at a 90 degree angle. It automatically adjusts to hold two different sizes of wood together. The jaws automatically adjust within a 4" range, such as 2" x 2", 1" x 3" etc. The die cast jaws are plastic coated to protect the work piece. The open design allows ample clearance to screw, dowel or staple material together while gluing. The maximum passage for T-joints is 1 1/8".