Metal drill bits -size:
4-12, 9 Steps (Diameter 4, 5, 6, 7, 8, 9, 10, 11, 12mm)
4-20, 9 Steps (Diameter 4, 6, 8, 10, 12, 14, 16, 18, 20mm)
4-32, 15 Steps(Diameter 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32mm)
Package:
1Pcs 5 Inch HSS center punch
3Pcs spiral step drill bits (step up drill bit)
Step cone drill bit- features:
Unique step structure, one drill can open various sizes of aperture, a ladder drill to a box bit
Stable,working witout pre-working
Titanium alloy coating reduces friction and HSS(High speed steel) offering a combination of hardness and toughness for wear resistance,has a longer service life
Scope of application: automotive sheet metal, repair and modification, bridge doors and windows, home appliances
Can be used for the following equipment: hand-held drilling machine, drilling machine milling machine, machining center
Having Mutifunction, a terrific helper to be used for deburring,chamfering,expanding hole
Note:
The speed of the hand drill is recommended to be 100-1000r/min.
The larger the diameter of the drill, the slower the speed requirement
Please cool down with water when working because of the high temperature,so that the validity period can last longer