The Milwaukee ice hardened hole saw delivers up to 50 percent longer life and 2x faster cutting than the competition. The Milwaukee ice hardened hole saw is made with a proprietary cryogenic process that consistently hardens to the core. The result is performance that is superior to traditional heat-treat processing. The saw utilizes bi-metal construction with 8 percent cobalt for increased wear resistance under high operating temperatures and optimized tooth form for greater cutting speed. For fast, tool-free change-outs, use Milwaukee's universal quick-change arbors. Rip Guard - the strongest tooth form in the industryLimited lifetime tooth break warranty8% cobalt construction for increased wear resistancePlug Jack - an all access slot design for fast plug removalFeatures rip guard teeth - teeth with more steel behind the cutting edge for added durabilityEquipped with plug jack - an all-access slot design for fast plug removalFeatures bi-metal constructionCoated with a low friction, thermoset paint that provides faster cutting speed in wood and more holes cut per battery chargeMade in the USA