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 2 double ended impact sockets for use on 22 and 27mm wheel nuts to overcome this issue. 1/2″D. Sizes include: 22 x 22.5mm, 27 x 27.5mm. Designed to use with 1/2″ short extension. Damaged wheel (lug) nut removal sockets. Overall length: 63.5mm. Ideal for use on 22 & 27mm chrome covered nuts that have swollen. Impact quality. Manufactured from chrome molybdenum.