4-20mm HSS Steel Titanium Step Drill Bits Step Cone Cutting Tool Core Drill Bit Steel Woodworking Wood Metal Drilling Step Drill
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 twist drill is not easy to be broken.
- Deburring, chamfering, elliptic hole enlargement, twist drill, the function of them was unable, but it is possible.
- The usage of tools: drill, bench drill. Work while water cooling, can effectively extend the service life of drill bit,
- Shank: 1/4 Hex Shank
- 4-20MM ( 4,6,8,10,12,14,16,18,20MM )
- Material: HSS 4241
- Size: Approx. 78*20*20mm / 3.07×0.79×0.79inch
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