Multi-functional design: Suitable for different type of screwdriver head, to meet the diverses needs of users, multi-purpose, saving space costs Strong adsorption: design is adopted to that the batch head is firmly adsorbed on the electric drill, which is not easy to fall, to operate and suitable for various working environments Humanized design: Comfortable control, smooth, reducing hand fatigue and improving work efficiency resistance design: Strong resistance, more stable and use, effectively avoiding accidental falling during work and improving constructions efficiency Hardness: Wear resistance and durability, long service life, durability, saving replacement cost and being recognized by users, Manufacturer: Jazuaiao