ADJUSTABLE TYPE; ASTM A1018/A653/B633 STEEL MATERIAL; 4-11/16 INCH X 4-11/16 INCH SIZE; ZINC ELECTROPLATED FINISH; CHANNEL USED ON; 1-5/8 INCH CHANNEL WIDTH; 7/32 INCH THICKNESS; HOT ROLLED PICKLED OILED PROCESS; 4 HOLE(S); 9/16 INCH DIA HOLE SIZE