SLOTTED TYPE; ASTM A1018/B633 STEEL MATERIAL; ZINC ELECTROPLATED FINISH; 20 INCH; 5-7/16 INCH; CHANNEL USED ON; 1-5/8 INCH CHANNEL WIDTH; 7/32 INCH THICKNESS; HOT ROLLED PICKLED OILED PROCESS; 250 LB LOAD RATING; 7/32 INCH CHANNEL THICKNESS