The Astro Pneumatic 8pc Torque Limiting Extension And Protective Impact Socket Combo Set, No. 78818, includes common torque limits and socket sizes for wheel mounting. The lug nut sockets include protective sleeves and inserts to prevent wheel damage, and are color coded for quick reference. The set consists of four Torque Limiting Extensions: 90, 100, 110 and 120ft/lbs and four Protective Lug Nut Impact Sockets: 17mm, 19mm (3/4"), 21mm (13/16"), and 7/8".