13PCS Cobalt Drill Bit Set 1.5mm-6.5mm, M35 HSS Twist Drill Bits for Carbon Steel, Stainless Steel, Hard Metal, Cast Iron, Plastic and Wood

Description: M35 cobalt steel 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. Tests shows that the M35 cobalt steel drill bits can penetrate a 5mm-thick 304 stainless steel plate in 5 seconds. Cobalt 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. Ideal For DIY, Home And General Building Engineering Using. Feature: -Cobalt steel drill bits particularly successful in cutting through hard metals such as stainless steel and cast iron. & Spiral design for the fastest removal rate and for thick material. -The cobalt increases the strength of the steel and makes it more heat-resistant. Speicifcations: Material: M35 Cobalt Steel(5 percent Cobalt and 95 percent High Speed Steel) Color: Gold Flute Type: Spiral Shank Type: straight shank Angle Point: 135 Degree Size: 1.5 / 2 / 2.5 / 3 / 3.2 / 3.5 / 4 / 4.5 / 4.8 / 5 / 5.5 / 6 / 6.5mm Notice: 1.The working life of the drill bits can be largely prolonged by using with cooling liquid. 2. Please keep the drill bit vertical with the stuff's surface to be drilled. Tilted bit is prone to break during drilling. Package Includes: 13 x Twist Drill Bits Reusable 1 x Plastic Case