1、Star screwdriver bit square socket is made of extra‑hard S2 alloy steel and forged in one piece, making it rustproof and durable. 2、Star screwdriver bit square socket is designed with circular arc drive square hole, holding stronger locking force. 3、Star slot of our tool holds large contact area, makingt it convenient to operate and able to avoid skid. 4、The whole bit is not easy to rust because the surface bluing treatment has been done. 5、Our tool can be used with tools such as ratchet wrench/bend rod/post/sliding rod. Item Type: Star Screwdriver Bit Square Socket Length: Approx. 200mm / 7.9 in Material: S2 alloy steel Surface Treatment: Bluish Bottom Square Diameter: Approx. 1/2 inch 1 x Socket