The 125 (3PK) High Speed ProDrill Drill Bits are ground at 135° cutting angle (lip) with a split point. Flat ground bits cut slower and are long lasting but less accurate and will walk while drilling. Split point ground bits will stay on center to reduce walking because they have four cutting edges and distribute loads better. These 125 (3PK) High Speed ProDrill Drill Bits work well on curved shapes and alloy and stainless steels because it creates smaller chips to minimize clogging holes and breaking bits. It also has a thinner web, requiring less force, because there is less heat and less chance of work hardening. 3 Pack Hardened high speed carbon drill bits designed to cut fast with steep cutting and relief angle. Split point design with two primary seat angles and two secondary cutting edges that delivering walk free precision drilling in all materials including and up to Rockwell Rc35 steel. Made in USA