The drill bit set include 2pc 5/16" drill bits. If you have specific drilling size requirements, then the drill bit is very suitable for you.
Premium 5% cobalt steel, 66-69 HRC (Rockwell Hardness Scale), usually give the best heat,wear and chip resistance and long tool life.
The cobalt drill bit set can be used effectively on most soft and hard objects, with a 135 degree point tip and twist design for faster cutting, self-centering to prevent walk-off and faster chip and particle removal.
The drill bits is designed with three flat shanks, which is non-slip and firm, bringing more convenience to your work.
Our drill bits are resistant to high temperatures and can withstand high temperature applications for long periods of time,its thick web spiral design provides extra stability in harsh applications.
