Hexagonal Shank Step Drill Cone Drill Bit Hole Groove Metal Wood Cutter

Description:     Features:100% and high quality!!The Drill is not easy to be broken.The ladder of its unique structure, a bit can open a variety of specifications of aperture.Do not need to use center punch, compared with the ordinary twistDeburring, chamfering, elliptic hole enlargement, twist drill, thefunction of them was unable, but it is possible.The use of tools: drill, bench drill.Work while water cooling, caneffectively extend the service life of drill bit, recommend drilling rate of 250-250 RPM.Specifications:Model: 3-12,4-20,4-12Material: High-speed steelColor: GoldSize: approx. 7.5- 8cm*2- 3cmShank: 6mm(dia), 25mm(L)Total: 85mm(L)Package Included:3 pcs x Hexagonal shank step drill

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