Empire Level 2760 Screw ID Gauge, SAE Standards 1 to 5/16-Inch SAE standards - #1 to 5/16-Inch Tempered steel 5/64-Inch thick, 5-1/8-Inch long Used to identify size of screws, bolts, rivets, wires, pins with length, diameter, wire size, screw pitch, and clearance drill size