Capri Tools CP21075 Certified Limiting Torque Screwdriver Set, Small, Black 10-50 inch-pound ergonomic torque screwdriver with 1/4-inch female hex drive Internationally recognized calibration certificate included: +/-6% - DIN ISO 6789 & ASME B107.300-2010 Adjustment in 1 inch-pound increments for maximum precision. Torque limiting feature causes screwdriver to slip, avoiding damage to the screw being driven Intuitive torque adjustment automatically locks after each setting Includes a sturdy carry case that fits the Torque Screwdriver, all 20 included screwdriver bits, and the T bar attachment (Included)