High Quality Chrome Molybdenum Steel, heat treated for strength and durability. Will fit any 1/2 Inch Impact Wrench or Manual Ratchet Driver. Colour coded sockets for easy identification. 360° Non-scratch plastic sleeve and insert protect bolt tops, wheel rims and lug nuts, to prevent scratches during use. Most popular sizes 17mm, 19mm and 21mm in 150mm length and with extra 3 plastic sleeves. Plastic sleeves are easily removable for a thinner-walled socket that fits in many small diameter lug nut holes in numerous aftermarket alloy wheels. All impact sockets will be delivered in a closable plastic case for transport and storage. Specifications: Material: Chrome Molybdenum Steel Drive: 1/2 Inch Sizes: 17mm, 19mm, 21mm Length: 150MM Package contents: 1 x 3 PCs Thin Wall Deep Impact Nut Socket Alloy Wheel 1/2" Drive 17mm 19mm 21mm and 3 Extra Plastic Sleeves Kit.