High visibility cases allow for easy tool identification and added safety in low light situations. Keys are precision formed for a precise fit and strong keys for high torque application. Made of heat treated, tempered alloy steel that resists rotational distortion Long arm keys for extended reach and higher torque6 piece metric hex set - 3, 4, 5, 6, 8, 10mm, 1/8", 9/64", 5/32", 3/16", 7/32", ¼"