5pcs M35 Cobalt-Containing Twist Drill Bit High-Speed Steel Double Head Metal Steel Plate Expansion Hole Drill, Model: Double Head 3.0mm, Double Head 3.0mm, Double Head 3.2mm, Double Head 3.5mm, Double Head 4.0mm, Double Head 4.2mm, Double Head 4.5mm

1. Material: high speed steel containing cobalt
2. Outer blade angle: 135 degrees
3. Scope of application: stainless steel, aluminum alloy, metal pipes, iron plates, etc.
4. Features: double-head design, easy to use, special sharpened head with 135-degree double back apex angle, high hardness, sharp and fast opening, smooth and sharp groove shape, cobalt-containing material, formed by whole strip grinding, vacuum heat treatment, Strong wear resistance
5. Specification: 3.0/3.2/3.5/4.0/4.2/4.5/5.0/5.2/5.5mm
6. Length: about 4.4 cm/piece for 3.0/3.2mm, about 4.8 cm/piece for 3.5mm, about 5.3 cm/piece for 4.0mm, about 5.5 cm/piece for 4.2mm, and about 5.8 cm/piece for 4.5mm , 5.0mm is about 6.2 cm/piece, 5.2/5.5mm is about 6.4 cm/piece,
7. Weight: about 5g/piece for 3.0mm, about 6g/piece for 3.2mm, about 7g/piece for 3.5mm, about 8g/piece for 4.0mm, 9g/piece for 4.2mm, 4.5 About 10g/root for mm, about 11g/root for 5.0mm, about 12g/root for 5.2mm, about 15g/root for 5.5mm