Bosch Professional HSS Bi-metal Hole Saw Set including 6 holesaws ranging from 19-57mm, two pilot drills, two arbours and an allen key. This set is ideal for plumbers and tradespeople who need to cut materials such as softwood or plastic and each hole saw is compatible with rotary drill/drivers and combi drills.. Materials: Softwood, Drywall, Metal Pipes and Profiles, Non-ferrous Metals, Plastics