10pcs M35 HSS Cobalt Drill Bits HSS-CO Drill Bits Set Twist Drill Bits 3.5mm for Drilling on Stainless Steel, Metal Thread Bit

MATERIAL: Made of M35 material, includes 5% cobalt, high hardness, stable performance HIGH QUALITY: with high surface finish, high grinding precision , the blade is sharp and durable in use WIDE APPLICATION: ideal for drilling on stainless steel, cast iron, sheet metal, steel plate, Angle iron; widely used in the drilling of stainless steel plate, automobile spring steel and die steel NOTE: The titanium drill bits set can NOT be used in the impact drill The straight shank twist drill is mainly composed of a shank and a working part. The cutting part of the working part has two main cutting edges and secondary cutting edges, which are responsible for all cutting work. The guiding part of the working part plays a role of guiding and preparing for grinding, and the chip flute is made into a spiral shape to facilitate chip guide.