Ensure that you always have the correst bit for every type of screw having a large collection of bits for various purposes allows you to work faster and without frustration this high quality set is durable and diverse enough to be used at home in a workshop ot by any tradesman includes 21x screwdriver bits titanium coated 25 mm long flat slot 4 mm 5 mm 6 mm 7 mmphilips ph 1 2 2 3 pozidriv pz 1 2 3 internal wedge profile t10 t15 t20 t25 t27 t30