This Carpet Bomb is a heavy tip. It is heat treated, hardened stainless steel with 5/16 threads. In this picture you can see the 1st generation hammer head and 2nd generation. The 1st will tighten down but have a gap. The 1st generation was the original 100 hammers everything after is 2nd. This tip will take the blending hammer from 2.25oz to 6.5oz. It does not fit on the 17 inch hammers.