【Premium Material】74 Piece Twist Bits are made of M35 Cobalt Steel with Molybdenum and Cobalt added to form a hardened alloy, measure Rockwell hardness up to 67, for faster cutting speed and longer service life, comparable to ordinary high speed steel Compared to drill bits, the service life is up to 12 times smaller.
【135 Degree Split Point】The 135 degree split point tip starts drilling immediately with less force and eliminates "walking" on the work surface. It is self-centering and can penetrate quickly with less pressure. Does not "walk" or "wander". Other small is 118°
【Package Included】Drill bit set includes 74pcs Metric M35 Cobalt Steel Twist Bits: 1MM x 10pcs, 1.5MM x 10pcs, 2MMx10pcs, 2.5MM x10pcs 3MMx5pcs, 3.2MM x5pcs, 3.5MM x5pcs, 4MMx5pcs, 5MMx5 pcs, 6MMx5 pcs, 7MMx2 pcs, 8MMx2 pcs, different sizes and enough quantity to meet your needs
【High Precision】The drill has high surface finish, high grinding precision, and the blade is sharp and durable. Compared with high-speed steel drills, cobalt steel can prolong tool life and maintain the toughness and hardness of the tool at high drilling temperatures. It is widely used in the drilling of stainless steel plates, automotive spring steel, and die steel.
【Suitable for】HSS cobalt drill bit set is ideal for drilling holes in stainless steel, cast iron, sheet metal, steel plate, angle iron. Although they can also be used on softer materials. Not suitable for hardened/high carbon steels. Attempt to adjust the RPM when it cannot penetrate. .
