10 Step Drill (1/2" hole range) UNIBIT

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Unibit NO.10 Step Drill (1/2" hole range).Single-fluted cutting edge - helps assure true round holes and allows greater control. Hardened steel for long life - constructed of industrial grade high speed molybdenum steel and heat treated to assure maximum durability.3 Flatted shank - prevents slipping in drill chuck.