1PC/3PCS 4-32mm 4-20mm 4-12mm HSS Cobalt Step Drill Bit Nitrogen Spiral Grooved Hole Cutter

1PC or 3PCS 4-32mm 4-20mm 4-12mm HSS Cobalt Step Drills Nitrogen High Speed ?‹​Steel Spiral

 

Material: High Speed ?‹​Steel 4241

Surface: Nitrogen treatment

Notch Type: Spiral Notch

Shank: Triangle Shank

1 * 4- 32 mm in 15 steps (4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32 mm)

1 * 4-20 mm in 9 steps (4, 6, 8, 10, 12, 14, 14, 18, 20mm)

1 * 4-12 mm in 5 steps (4, 6, 8, 10, 12mm)

Application: for Drilling Carbon Steel Sheet Iron Insulation Boards

 

??The most popular job that uses step drill bits is sheet metal working.

??People also use step drill bits on auto repair projects and apply them as countersinks.

??The Migiwata step bits come to a point and are thus self-starting. No need to use center punch.

??They are more durable and not prone to break compared with  twist drills.

 

 

1. Due to manual measurement, please allow a bit error, thank you

2. Due to shooting problems such as light, there will be chromatic aberration, please be careful.