Specification:Product name: Impact screwdriver bitSurface treatment: blackening treatmentMaterial: S2 alloy steelLength: 36/80mmShank diameter: 8mmStyle: phillips, slotted, inner hexagonFeatures:1 It is product of high-quality S2 alloy steel, and is heat-treated as a whole, with high hardness, high torque, and durability The floor is professionally blackened, beautiful and simple to rust The screwdriver head has solid magnetic treatment, which is convenient for operation and use Included:3/7Pcs Impact Screwdriver Bit