For servicing metric truck wheel fasteners, this 1" (2.5 cm) drive impact socket set includes seven of the most common sizes for high-torque applications. It contains 6-point deep sockets in 30 mm, 33 mm, 35 mm, 38 mm, and 41 mm sizes, as well as 17 mm and 21 mm 4-point square sockets. The complete 7-piece set weighs 15.5 lbs (7 kg) and provides the specific dimensions required for commercial vehicle wheel maintenance.