4-12 4-20 4-32mm HSS Step Drill Bit Nitride Coated Spiral Grooved Sted Drill

Features:

High hardne, unique sted structure, a drill can open a variety of size aperture.

Suitable for these work-pieces that hardne is lower than 25 degree and the thickne is beyond 4mm, such as aluminum parts, insulation board, PVC plate, etc.

The central punch is not needed, small shaking, hard to be broken.

Used with drill or bench drill, water it to cool while working to prolong its life, the proper drilling speed is 250-400 rpm.

Special step design, one drill for many sizes, very convenient.

Specifications:

Material: HSS 4241

Shank: hex shank

Shank diameter: 6mm

Groove: spiral

Surface treatment: Nitriding black

Step quantities           Step diameter                                                                Net weight

5 steps                   4,  6, 8, 10, 12mm                                                              approx. 20g

9 steps                   4, 6, 8, 10, 12, 14, 16, 18, 20mm                                        approx. 42g

15 steps                  4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32mm      approx. 137g

Note: Please allow 1-3mm error due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.

About shping
Shping and Packaging All it will be double checked and well packed before sending.It will be dispatched within 2 business days after buyers pay for the order. It usually takes about 14 to 18 working days for delivering the package to the destination(for e areas,it may take a little longer). 

Special Announcement:
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