STROTON Metric M42 8% Cobalt Drill Bits Independent Packaging of Each Specification for Stainless Steel and Hard Metal (2.5mmx5pcs)

• Premium M42 8% Cobalt Steel ,68 70 HRC (Rockwell Hardness Scale) ,Usually Give the Best Heat,Wear and Chip Resistance and Long Tool Life.
• For Cutting through Stainless Steel,Hard Metals,Aluminum,Plastic and Hardwood.
• This Cobalt Drill Bit is Typically Capable of Running Three to Five Times Faster.Despite the Higher Price,the Cost Per Hole When Using Cobalt Drill Bit Will be the Lowest,Since It Can Produce So Many More Holes.
• The Sufficiently Sharp Bit Edge Can Cut the Metal Material into Long Strips of Iron Chips rather than Slowly Grinding Throng the Material with a Blunt Drill Bit.
• The Bits of 3.5mm and above are Designed with 3 Steps.This 2.5mm x 5pcs M42 Cobalt Drill Bits are Common Drill Edge Design.

Product advantages: (1) The sharp edge immediately starts drilling with less force and eliminates "walking across the work surface. (2) Holds better than generic high speed steel, cobalt gives high speed steel more heat and wear resistance. (3) This drill bit set is made of high quality cobalt ($80,000 per ton). (4) The metric M42 cobalt drill bits can cut through stainless steel and carbide and hardwood, although they can be used for softer materials such as aluminum, plastic. Some important tips for drilling stainless steel and carbide: (1) Controlling the drilling speed from 200 to 1000 rpm makes it easier for you to drill holes on stainless steel. ____________________________ Stainless Steel ________________________ Drill Diameter - RPM ________________________ ≤ 5 mm ________________________ 5-10 mm ________________________ 10-15 mm 350-200 ~ 200 ____________________________ (2) Add stainless steel threading oil or engine oil to prevent the stainless steel from overheating and forming a very hard oxide layer. It also works to add some vinegar, soy sauce or water if you don't have engine oil.