This bahco 7 piece diamond bit set contains the following 1 x phillips 25mm bit ph21 x pozi 25mm bit pz24 x torx 25mm bits t15 t20 t25 t301 x universal bit holder 14 inch drive the bits are made from high performance alloy steel their tips are coated with thousands of tiny industrial grade diamond particles providing high strength and good wear resistance this also significantly reduces the cam out effect to deliver the required torque to drive the screw supplied in a handy plastic storage case