Features 1、Precise and varied metric sizes, 5 larger size nuts or bolts. And sockets work in SAE/metric sizes‑17mm, 19mm, 21mm, 22mm. 2、Made of impact resistant chromium‑molybdenum steel with excellent durability and corrosion resistance and excellent grip strength. 3、The thicker walls provide the strength required for the sleeve, and the socket's reverse spiral groove (right‑handed design with internal threads) is designed to bite and merge to provide maximum grip. 4、Provide a large bite to remove larger size nuts or bolts. Impact square drives are all 1/2in drive for a variety of working applications. 5、The driving end is hexagonal and can be used with flat wrench, pliers, adjustable wrench, socket or vice. 6、1/2in impact rated square drive for use with pneumatic tools. In addition, it can also be converted into a hex adapter for use with impact drill. Specifications: Item Type: Nut Bolt Remover Set Material: Chromium Molybdenum Alloy Sleeve Shape: Plum Pattern Drive: 1/2in Sleeve: 17mm/0.67in, 19mm/0.75in, 21mm/0.83in, 22mm/0.87in (for Most Car Tire Nuts) Applicable Place: Automotive maintenance, industrial, building, home field Usage: Suitable for removing rusted irregular bolts and nuts Package List 4 x Sleeve 1 x Extension Bar 1 x Plastic Box