The Milwaukee Thunderweb HSS-Ground Metal Drill Bit set contains 25 HSS-G drill bits designed for use with Combi Drills and Drill Drivers. THUNDERWEB design is characterised by a conical shaped web which gets thicker towards the back of the drill bit. Standard drill bits have a constant thickness throughout their length. Even at the narrowest point the THUNDERWEB core is thicker than that of a standard drill bit For the full list of drill bits included in this set, please see the Contents tab.