DEWALT® bit tip inserts are make fro shock-resistant tool steel for maximum durability and longevity. The advanced hardening process provides maximum durability. For use in bit tip holders for driving screws in a variety of materials. Set includes: 5/64 in., 3/32 in., 7/64 in., 1/16 in., 1/8 in., 9/64 in., 5/32 in., 3/16 in. And 1/4 in. Hex bits.