Material: chrome vanadium steel Thin wall sockets for use on alloy rims. With plastic coating to protect your alloy rims Suitable for pneumatic screwdrivers and impact screwdrivers It is an ideal choice of the professional, the range is so vast that it covers a wide range of markets and applications Product description Specifications: Material: chrome vanadium steel Quantity: 3 pcs Sizes: 17 mm, 19 mm and 21 mm Fits any 1/2" ratchet/bar Corrosion resistance: hardened, tempered and anodized material Package contains:< /p> 1 x 3 pcs Impact Sockets Our product is a replaceable rim protector. Finished in lacquer, it is very resistant to corrosion. It is both slim and robust and will become your most practical tool. Professional tools for all applications, proven by long experience A range of high quality products with a good price/performance ratio . Thin-walled bushings for use on alloy wheels. Tough nylon coating on the outside of the bushings prevents chipping and scratching inside the holes of wheel nuts.