STROTON M42 8% Cobalt Drill Bits for Stainless Steel and Metal (5.5mm x 4Pcs)

• Premium M42 8% Cobalt Steel ,68 70 HRC (Rockwell Hardness Scale) ,Usually Give the Best Heat,Wear and Chip Resistance and Long Tool Life.
• 3 Steps Desigh 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.
• Includes :M42 Cobalt drill bit 5.5mm x 4pcs ,135 Degree Split Point

Product advantages: (1) Sharp Edge starts drilling immediately with less force and eliminates "stepping" on 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 Premium Cobalt ($80,000 per ton). (4) M42 metric cobalt drill bits can cut through stainless steel and hard metal, hardwood, although they can be used for softer materials such as aluminum, plastic. Some important tips on drilling stainless steel and hard metal: (1) Controlling the drilling speed from 200 to 1000 rpm would make it easier for you to drill holes on stainless steel. ________________________________ Stainless Steel ____________________________ RPM Drill Diameter ____________________________ ≤5mm ____________________________ 5-10 mm ____________________________ 10-15 mm ________________________________ (2) Add stainless steel tapping oil or engine oil to prevent the stainless steel from overheating and forming a very hard oxide layer. It also works by adding vinegar, soy sauce, or water if you don't have motor oil.