High Quality Material The whole impact screwdriver set is made of vanadium steel, which has high hardness, wear resistance and rust resistance. Don't worry that the product is easy to deform and rust will affect use. Massive PowerEach strike of a hammer or mallet on the base of the hand-operated screwdriver results in a concentrated rotational force at the tip of the tool screw. Enough torque to start loosening or tightening brake calipers, rotors, rotors and motorcycle case screws. AdjustableThe head can be adjusted by rotating the head back and forth and tightening or removing screws. Point "L" to loosen the screw, point "R" to tighten the screw. Ideal for loosening rusted or overtightened screws or nuts</ p>