Feature●No need to use center punch as compared to normal twist drills that are not easy to break●Deburring, chamfering, enlarging oval holes, twist drill, and didnt do these functions●He can use the tools: Drill, bench drill.Work can effectively extend the life of the drill bit, while keeping water cooled●Shank: 1/4 hex shank "\●Its unique structure of the ladder and bit allows you to open the various specifications of the openingDescription
HSS Steel Step Cone Drill Titanium Bit Set Hole Cutter Hex Shank