brand new and high quality
Features:
Unique ladder structure, it can open multiple aperture.
It can deburr, chamfer and open hole, but ordinary twist drill canfor .
Little rock, it can carve out a nice aperture without firstly using a center punch.
Water to make ti cool while working, it can effectively extend the service life.
Deburring, chamfering, elliptical hole enlargement, twist drills, drills, table drills.
Widely used to cut holes in a variety of material like steel, wood, thin iron, aluminum alloy, insulation boards, PVC sheet,ect.
Recommended drilling speed 250--400 rpm.
Suit for use in hardness under 25° artifacts,The plate thickness under 5mm.
Step Drill Bit only, other accessories demo in the picture is not included.

Specifications:

Material: HSS
Size: app.app.10x98mm/0.39x3.86in
Style: 4-42mm（4, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42mm）
Color: Golden
Quantity: 1 Pc

Note:

No retail package.
Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.
Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!

Package Includes:
1 x Step Drill Bit