13x HSS Cobalt Drill Bits Set Twist Jobber Length for Hardened Metal 1/16"-1/4''
Features：
Higher quality materials: Heavy-duty twist drill bit made of 5% Cobalt alloyed high speed steel. Bronze steam surface treatment provides a combination of hardness and toughness for wear resistance;Rigid, thick web design strengthens the core to increase flute durability.
More professional performance: Self-centring 135-degree split point tip helps to reduce thrust and aids an easier penetration; Tips are professionally hardened and polished for more accurate and fast drilling and faster removal of chips and particles.
More comprehensive applications: The cobalt drill bit set can be used effectively on most soft and hard objects, such as stainless steel, cast iron, high temperature alloy, titanium alloy, plastics and woods.
