Sonic Ratchets and Sockets are made from Chrome Vanadium steel while socket bits are made hardened tool steel. The 1/2” Flank Sockets have reliefs in the corners, allowing the socket to bite into the flats of the fastener, mitigating the chance of stripping. In addition to the 1/2” drive ratchet, this set also includes a sliding T-handle, 2 standard extension and 2 Wobble Extensions. Adapters, a universal joint, and two wheel sockets round-out this 61-pc kit.