6-Point impact sockets are made from chrome moly steel with a black oxide finish. Set includes a 1/2" drive extension, 17mm/17.5mm, 19mm/19.5mm, 21mm/21.5mm, 22mm/22.5mm, 27mm/27.5mm and a deep thin-walled 19/21mm socket. The 19/21mm socket includes a plastic sleeve that prevents scratching the wheels. Comes in a blow molded storage case.