Description: Turn Square Head Hex Shank Extension Bar Beaded Sleeve 1/4 3/8 1/2 Sleeve Wind Batch Electrical Connection Toggle Lever. Length 50mm. Converts any electric drill into a socket screwdriver Strong spring loaded ball bearing keeps sockets securely in place, sockets snap shut They hold tight and won't slip off. Constructed with rust-resistant chrome vanadium steel for long life. Handles for the toughest jobs. Hexagon shaft saves time changing from an electric drill saves time over traditional hand nut drivers. Set hardened and treated treated chrome vanadium steel alloy for excellent strength and durability prevents stripping during high speed operation. Specification: Name: 3pcs Steel Ball Mount Material: Chrome Vanadium Steel Color: Black Length: 50mm Size: 1/2(12.7mm),1/4(6.35mm),3/8(9.5mm)(Approx.) Application: Suitable for screwdriver handle or electric screwdriver tool Quantity: 3pcs Package include: 1 * 1/4 inch Drive 1 * 3/8 inch Drive 1 * 1/2 inch Drive Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.2. Please allow slight manual measurement deviation for the data.