Bovidix 5041042 Socket Adapter & Reducer Set (6 Piece), Chrome Adapters greatly expand your existing socket and ratchet/driver selection Spring loaded ball on every adapter and a detent on every side of inner surface securely hold a socket on the adapter and the adapter on the ratchet Through hole on a 1/2-inch and 3/4-inch adapters for locking on an impact driver Made from chromium-vanadium steel by hot forging and industrial chrome plating for ultimate durability Comes with a size labeled plastic case for easy storage