Some wheel nuts are manufactured with a permanently fitted chromium plated cap. These start off from the factory as a whole size, but over time due to the combination of corrosion and impact tool use, the wheel nuts can swell by up to 0.5mm. This set includes 3 double ended impact sockets suitable for use on Ford, Range Rover and Jeep models to overcome this issue. 1/2″D. Sizes include: 16.5 x 17.5mm, 18.5 x 19.5mm, 20.5 x 21.5mm. Designed to use with 1/2″ short extension. Damaged wheel (lug) nut removal sockets. Overall length: 63.5mm. Applications include: Ford, Range Rover, Jeep. Impact quality. Manufactured from chrome molybdenum.