Astro Pneumatic’s 10-PieceTorque Limiting Extension Set includes the following 1/2-Inch Drive/8-Inch Torque Limiting Extensions: 65ft/lbs. (90Nm), 75ft/lbs. (100Nm), 80ft/lbs. (110Nm), 90ft/lbs. (120Nm), 100ft/lbs. (135Nm), 110ft/lbs. (150Nm), 120ft/lbs. (160Nm), 130ft/lbs. (175Nm), 140ft/lbs. (190Nm), 150ft/lbs. (200Nm). This set allows you accurately torque wheel nuts to recommended torque while increasing efficiency and eliminating damage caused by impact wrenches. There is no maintenance or calibration necessary. The set is made of Chrome Molybdenum and is color coded with a matt finish.