PB4-Powerbor-Cutter-Pin-Kit-5-Piece-G-J-Hall-20K04-p-The-Halls-Powerbor-reg-Cutters-Kit-produce-a-solid-slug-of-steel-that-is-ejected-when-the-cutter-breaks-through-&-the-hole-is-complete-This-reduces-the-problems-experienced-by-the-swarf-&-chips-generated-by-conventional-drilling-p-p-The-cutters-are-ideal-for-cutting-general-engineering-&-structural-steels-&-they-dramatically-outperform-conventional-twist-drills-in-terms-of-cutting-speed-&-tool-life-p-p-Each-Powe