Different types of drill bits are used to cut holes in different types of materials. Drill through metal like a champion! High speed drill bits are more expensive than other drill bits, but if you regularly drill through metal, they are a good investment since they tend to last longer. This set of Gizhome M35 high speed steel drill bits are particularly successful in cutting through wood, rubber, bamboo and plastic. DO NOT suggest to cut hard metals such as hard metal ,stainless steel and cast iron. Cobalt drill bits are not made of pure cobalt, but rather a steel alloy with certain percent cobalt. The 5-percent alloy is known as M35 grade. The cobalt increases the strength of the steel and makes it more heat-resistant; this is an important factor in drilling materials Notice: The working life of the drill bits can be largely prolonged by using with cooling liquid. Specifications: Material: M35 High Speed Steel(5% Cobalt and 95% High Speed Steel) Angle Point: 135 Degree Flute Type: Spiral Hardness: Rockwell 67 Shank Type: straight shank You will get: 19pcs of M35 cobalt steel twist drill bits: 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm. 19Pcs are Packed in a Plastic Bag For Easy Usage And Store. No such words as "Cobalt Steel " is printed on the case, but they are.
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