Arrival 5pcs HSS COBALT MULTIPLE HOLE Step Drill Bit Set

Scope of application: suitable for the workpiece below 25°, such as cast iron, carbon steel, aluminum plate, Sheet iron, plastic, wood etc.

Special note: Do not use for hard metal drilling.

Features:

This ITEM IS Brand NEW ,

This set replaces 50 individual drill bits. Two-flute design gives you faster, smoother cutting. 3-sided (TRI-FLAT) shank will not slip in your drill's chuck. Cobalt coated for smoother cooler cutting.

SELF STARTING - No need for a pilot hole.

Cobalt coated to reduce friction and run cooler

Large bit has 3-sided shank and small bits have hex shank to prevent slip in driver chuck

Automatically deburrs holes as you drill

Materials: M2 high speed steel

Includes protective padded aluminum case

Sizes:

# 1: 3/16 "to 1/2" 6 Steps (3/16 '', 1/4 '', 5/16 ", 3/8 '', 7/16 '', 1/2 '')

# 2: 1/8 "to 1/2" 13 Steps (1/8 ", 5/32", 3/16 '', 7/32 ", 1/4 '', 9/32", 5/16 "11/32", 3/8 ', 13/32', 7/16 '', 15/32 ", 1/2 '')

# 3: 1/4 "to 3/4 '' 9 Steps (1/4 '', 5/16", 3/8", 7/16", 1/2", 9/16", 5/8 "11/16", 3/4 ")

# 4: 1/4 "to 1-3 / 8" '10 Steps (1/4' ', 3/8 ", 1/2", 5/8 ", 3/4", 7/8 ", 1 ", 1-1 / 8" 1-1 / 4 ", 1-3 / 8")

# 5: 3/16 "to 7/8" 12 Steps (1/4 '', 5/16 ", 3/8", 7/16 ", 1/2", 9/16 ", 5/8" , 11/16 ", 3/4", 13/16 ", 7/8")

Package includes:

1 x 1 / 4-1-3 / 8 Step Drill

1 x 3 / 16-7 / 8 Step Drill

1 x 1 / 4-3 / 4 Step Drill

1 x 1 / 8-1 / 2 Step Drill

1 x 3 / 16-1 / 2 Step Drill

1 x Aluminum Box

Drill Shank Diameter

1 / 4-1-3 / 8

9mm

3 / 16-7 / 8

9mm

1 / 4-3 / 4

9mm

1 / 8-1 / 2

6mm

3 / 16-1 / 2

6mm

Please note ：

1. Hand drill (more than 550W) operation;Thickness of 1-2mm, aperture is greater than 14mm

On, need bench drill operation.(It is recommended to drill workpiece with hardness below 25°)

When drilling, water injection and cooling can be used to effectively prolong the service life of drill bit Life.

(Recommended speed 250~400)

The two colors are shipped randomly and the quality is the same.

The surface of the box is coated, the collision during the assembly and distribution of goods will cause the phenomenon of scratching the paint is unavoidable, please do not open disputes