MALLEABLE IRON MATERIAL; 3/4 INCH MAX. JAW CAPACITY; CHANNEL APPLICATION; ASTM A47 MATERIAL SPECIFICATION; 150 LB LOAD CAPACITY; 1/4 INCH-20 TPI SCREW SIZE; SQUARE HEAD SCREW TYPE; YES SUPPLIED WITH SCREW; OVERALL DIMENSION 1-3/8 INCH L X 1-3/16 INCH W