The dewalt dt7916 screwdriver bit set includes a selection of tough professional quality screwdriver bits the bits have a hardened core for strength and durability with extra grip ribs to grip the screw and reduce slippage contains 3 x 25mm phillips bits ph1 ph2 ph3 3 x 25mm pozi bits pz1 pz2 pz3 4 x 25mm torx bits t10 t15 t20 t25 1 x magnetic bit holder