High Speed Steel Step Drill Bit, 4-42mm Titanium Step Drill Multiple Hole Stepped Up Cone Bit for DIY Lovers

Unique step structure, one drill bit can open a variety of sizes and sizes, and one step drills to a box of drill bits.
No need to use the center punch, compared with ordinary twist drill is not easy to break. On-site construction, a variety of specifications for a step drill.
Deburring, chamfering, open elliptical hole expansion, twist drill can not complete the function it becomes possible.
Compared with ordinary twist drills. Shaking is small, and you don't need to lead the center punch to open a beautiful aperture.
The use of tools: pistol drill, bench drill. When the water is cooled while working, it can effectively extend the service life of the drill bit. The recommended drilling speed is 250-400 rpm.

Specification:

Name: Step drill

Material: high speed steel 4241 (suitable for workpieces with hardness below 25°, such as carbon steel, sheet thickness below 5MM)

Specifications: 4-42mm (4,6,9,12,15,18,21,24,27,30,33,36,39,42) 10mm handle

Surface treatment: titanium plating

Package Content:

1PCS Step drill

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