Empire Level 2760 Screw ID Gauge (SAE Standards 1 to 5/16-Inch) is made from tempered steel 5/16-Inch thick and 5-1/8-Inch long. The Empire Level #2760 Screw ID gauge has SAE standards - #1 to 5/16-Inch. Used to identify size of screws, bolts, rivets, wires, pins with length, diameter, wire size, screw pitch, and clearance drill size.SAE standards - #1 to 5/16-InchTempered steel 5/64-Inch thick, 5-1/8-Inch longUsed to identify size of screws, bolts, rivets, wires, pins with length, diameter, wire size, screw pitch, and clearance drill size