CrMo SCM440 alloy steel with high resistance to pulsating forces, driven by impact wrenches with a 1/2" drive, bit length 78 mm. The bit tips have been selected for repairs of mechanical elements such as: heads, hubs, spindles, drive systems and gearboxes. TECHNICAL DATA: sizes 5, 6, 8, 10, 12, 14, 17, 19 length 78 mm hardness (HRC) 54