6Pcs Set METAL HSS Twist Drills Bit Set 2mm 3mm 4mm 5mm 6mm 8mm Twist Drill Bits 2-8mm Hex Shank Drive Quick Change High Speed For Drill Machine Chuck

Description: 6Pcs Metal HSS Twist Drill Bit Set

6Pcs Set METAL HSS Twist Drills Bit Set 2mm 3mm 4mm 5mm 6mm 8mm Twist Drill Bits 2-8mm Hex Shank Drive Quick Change High Speed For Drill Machine Chuck

A twist drill is a metal rod of a specific diameter that has two, three or four spiral flutes running most of its length. Two-flute drills are for primary drilling, whereas three- and four-flute drills are only for enlarging cast or punched holes in a production situation. The section between the two flutes is called the web, and a point is formed by relief grinding the web to an angle of 59° from the drill’s axis, which is 118° inclusive. This forms a sloped cutting edge at the edge of the flute, which is called the lip. A twist drill is very inefficient at the point because the web leaves scant exit space for debris (called swarf) and because the point has a low surface speed compared to the periphery. For this reason, a good scheme for drilling larger holes is to first drill 1/4″ or less and then follow with the drill of the desired diameter.

Features:

• 100% brand new and high quality.
• This set of durable 6pcs piece drill bits lasts six times longer than standard drill bits.
• Titanium coating facilitates faster penetration with less effort.
• Suitable for use with sheet iron, aluminum, copper, wood, plastic etc.(Not for stainless steel and other high hardness metal.)
• High hardness, high wear-resistance and high toughness.
• The one-in-all formation of grinding, precise size, long lifespan, durable.

Specification:

• Material: Metal HSS
• Color: Golden With Black
• Size: 2mm, 3mm, 4mm, 5mm, 6mm, 8mm

Package Include:

• 1 x 6Pcs Metal HSS Twist Drill Bit Set