10 Pcs High Speed Steel Cobalt Drill Bit Set

Package quantity: 10 pieces

2x 1mm(3/64") Diameter, 35mm Length

2x 1.5mm(1/16") Diameter, 40mm Length

2x 2mm(5/64") Diameter, 49mm Length

2x 2.5mm(3/32") Diameter, 56mm Length

2x 3mm(1/8") Diameter, 62mm Length

Shank: straight shank

Material: industrial grade High Speed Steel with 5% cobalt alloy

Tip point: 135-degree split-point tip

Package: plastic bag

Very tough professional cobalt drill bit set for micro hole drilling into stainless steel, light-gauge metal, high-carbon steel, aluminum and ally steel, cast iron, abrasive alloy metal, other hard metal and hardened steel. 4 times life time than normal metal drill bit when drilling into PCB board, plastic, wood, jewelry, sheet metal and normal steel. Fast and precise drilling, heavy duty with long life time. If drilling or cooling oil is applied, it can reach even better drilling result and prolonged life time when drilling into very hard materials. Ideal micro drill bit for PCB board drilling, IT hardware engineers, repairing and maintenance staff, jewelry artists, wood working DIYers, hard metal part processors and other hand work professionals

User Tips

1) When drilling into hard metal, please keep the power drill at low rotating speed to let the drill bit cut the material little by little. The harder the metal is, the less speed shall be applied when drilling. Fast drilling speed applied on hard metal can also lead to drill bit breakage and fast wearing off

2) If you can make a pilot punch hole on the drilling point, it will also help to cut the material faster and provide a longer life time for the drill bit.