The De Walt DEWDT7507 impact socket 9 piece set is supplied in a socket set case comprising: 1 x Impact socket: 10 mm. 1 x Impact socket: 13 mm. 1 x Impact socket: 15 mm. 1 x Impact socket: 17 mm. 1 x Impact socket: 19 mm. 1 x Impact socket: 22 mm. 1 x Impact socket: 24 mm. 1 x Impact socket: 27 mm. 1 x 1/4 inch to 1/2 inch adaptor. These sockets are heavy-duty & designed to fit a 1/2 inch powered impact wrenches.