Has an anti-slip design on the open end jaw that locks the wrench on the fastener to deliver 400% more gripping power and helps to prevent slippage that results in scraped knuckles.72 tooth gear with 5 deg arc swingStamped hashmark pattern on wrench handle helps provide added grip pointsSizes stamped twice on both sides of wrench handle for easy size identificationStamped markings provide permanent visibility and helps prevent wear over timeDirectTorque technology helps prevent rounding of fasteners15 deg offset open end allows an increased range of arc swing in tight spaces