"Single lifetime warranty drill bit","Nitro-tip design cuts up to 37% faster and stays sharp up to 50% longer","Easy self-starting tip that allows for work on curved surfaces and without starting with a smaller bit size","Specialty nitride coated flutes to prevent chip build up and aid in chip extraction","3-flats on shank 17/64" NITRO-TIP DRILL BIT DB1764NT | Matco Tools