Heat-treated CR-440 steel. High visibility laser-etched markings. O-ring and retaining pin compatible. "DirectTorque" technology, black oxide coating. Set includes Metric: 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, SAE: 3/8 in, 7/16 in, 1/2 in, 9/16 in, 5/8 in, 11/16 in, 3/4 in, 13/16 in, 7/8 in, 1 in, 3/8 in drive 6-point impact extension 3 in, 3/8 in drive quick-release ratchet, 3/8 in drive drill Adapter with a lockable stacking case for easy storage.
