steel: the screwdriver is from steel, with good selection and durability Tail opening: the tail opening design of the screwdriver handle is for hanging and storage. When the force is insufficient, it can pass through from here to form a borrowing force Powerful the newly upgraded screwdriver head's force is doubled, which is several times that of ordinary screwdriver head Anti skid handle: screw driver anti-skid handle, the overall molding is not loose. The handle has anti-skid design, which doubles the anti-skid effect Rust proof set: this screwdriver set adopts which will avoid rust well, Manufacturer: SkyPOOU