14 bit drills stainless steel at the speed of 150-300 rpm, which is used for drilling bits with a diameter of 23. Twist drills are usually used to drill holes in stainless steel workpieces. For hardened stainless steel, cemented carbide bits can be used, and superhard high-speed steel or ultra-fine grained cemented carbide bits can be used when conditions permit. When drilling, the torque and axial force are large, the chips are easy to stick, break and remove, the work hardening is intensified, the corners of the drill bit are easy to wear, and the poor rigidity of the drill bit is easy to produce vibration. Therefore, the drill is required to grind the chip separation groove, reduce the transverse edge of axial force and improve the double apex angle of heat dissipation conditions.