Our holesaws have an alloy steel body and high-speed cobalt teeth that are electron beam welded to the body. The alloy steel body is shatter resistant for superior durabilty and the cobalt teeth cut faster and stay sharp longer than standard steel teeth. They are designed for cutting wood, plywood, plastic, fiberboard, any machinable metal including nail-embedded wood, pipe, stainless steel, steel etc. Made in the USA.