1. Colored steel ball hexagon to square head socket extension is with chromium vanadium alloy steel, the surface is chromium plated, and the hardness is high, the torque is large, and the wear resistance is strong. 2. With steel ball 1/2inch (12.7mm) 1/4inch(6.35mm) 3/8inch(9.5mm), the steel ball is prevented from falling off, and the clamping is tighter and does not . 3. Hexagonal extension S2 is made of Chrome vanadium steel to prevent rust. The magnetic bit is firmly absorbed and not easy to fall off. It can be used for pneumatic tool bit and power tool transfer. 4. Detachable double-head bit with strong magnetic ring, strong suction force and locking screw. Colour:Photo Color Material:Chrome vanadium steel Package Contents: 1 x Extension set Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.