Feature(may vary by option.)

●Made of high quality cobalt high speed steel for excellent durability
●The surface treatment is treated with a titanium nitride coating for excellent heat resistance and abrasion resistance
●Each tier has 10 tiers of 4, 5, 6, 7, 8, 9, 10, 11, 12, 13!
●Applications: Ideal for drilling holes in stainless steel (0.08 inch (2.0 mm)), iron plate (0.1 inch (3.0 mm)), aluminum, plastic, resin, wood, etc
●Hexagonal shaft (0.25 inch (6.35 mm)), so it can be used with charging impact drivers, charging drill drivers, and electric drills
●Also compatible with stainless steel (SUS304)
●Highly rated by professional craftsmen on many sites

[Step Drill 4-16mm]

[Step Drill 4-22mm]

[Step Drill 4-13mm]

Description

The strongest professional quality step drill: Cobalt high speed steel can be used on stainless steel and long life; Uses titanium nitride aluminum coating that is stronger than titanium coating (gold color); Excellent sharpness and ensures improved work efficiency.