4pc 1/4" HSS M35 Cobalt Spiral Grooved Step Drill Bits 3-12 4-22 6-24mm

Description

Description
[SEE THE VIDEO PLEASE!]

Video will open in a new window
Features:
Made from HSS-Co, heat treatment to it, high hardness, high wear resistance, high toughness, high bending strength, sharp edge, the best choice for processing stainless steel, better than ordinary step drill.
Unique step structure, a drill can punch out a variety diameters of holes.
Does not need center punch to assist it, compared with ordinary hemp flower drill, it is stabler and difficult to be broken.
It is suitable for being installed on the pistol drill and bench drill, applicable for punching on these harder workpieces, such as stainless steel, carbon steel, aluminum plate, iron plate, etc.
Note:
Please water it for cooling while punching so that can prolong its lifetime, rotation rate from 250 to 400 is recommended.
Specifications:
Material: HSS-Co
Handle type: Hex handle
Handle diameter: 1/4"(6.35mm)
Step quantity   Edge length  Handle length     Step diameter
001      9steps             50mm          31mm           3/4/5/6/7/8/9/10/12mm
002     10steps            50mm          31mm           4/6/8/10/12/14/16/18/20/22 mm
003     11steps            57mm          31mm           6/8/10/12/13/14/16/18/20/22/24 mm
Package Included:
3pc HSS-Co Cobalt Spiral Groove Step Drill Bit(
15050090S01)
On Jun-29-21 at 20:31:03 PDT, seller added the following information: