Kang&reg; HOT 75/100/150mm Quick Release Magnetic Screwdriver Extension Bit Holder 1/4 Hex (1 Set (75mm+100mm+150mm)) High hardness, non-slip, large torque, long life and durable. The screwdriver head has strong magnetic so that it can self-lock the connecting rod. Strong practicability, it can change external six angle into internal six angle. It can join electric screwdriver, screwdriver, screwdriver nozzle, screwdriver head. Shank diameter: 1/4 inch (6.35mm), Sleeve diameter: 10mm, Sleeve significant depth: 9.5mm