6 Pcs 1/4" HSS Spiral Hex Shank Combination Drill Screw Tap Bit Set (M3-M10) with Automatic Spring Loaded Center Punch Tool;

6PCS 1/4" Hex HSS Composite Spiral Screw Tap Drill Thread M3-M10 with Automatic Center Punch Tool

Specification:
Material: High-speed steel(HSS 4341)
Color: Silver
Metric: M3x0.5, M4x0.7, M5x0.8, M6x1, M8x1.25, M10x1.5
Shank: 1/4" (6.35mm) hex shank
Size: M3, M4, M5, M6, M8, M10
Center punch material: iron, high-speed steel punch head, brass protective coating
Center punch size: 13 cm/ 5 inch in length, 1.27 cm/ 0.5 inch in diameter
Usage: Suitable for drilling, tapping, cutting on soft metal, aluminum plate, iron, etc.

Description :
1.High hardness, rustproof, solid and durable.
2.The advantage is opening, tapping, chamfering.
3.Self-centering point, do not need assistant center drilling or center punching.
4.Drilling and tapping in one, one-step processing, greatly save processing steps and time costs, improve working efficiency.

Features :
1. Save processing steps and time costs, improve efficiency
2. Spiral groove, within the processing thread, cutting up to exclude, and was curled applied internally threaded through holes

Package include:
6 x Compound Tap Drill Bits
1 x Automatic Center Punch Tool

Caution: When you use this drill bits, the material temperature will get very high, please add some water or coolant to avoid the material get smoke when using it.
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