All step drills have three flats ground on the shank, preventing the drill from slipping in the chuck. A balanced double flute provides two cutting edges for faster and easier cutting in most soft and hard materials. They are available with 1⁄4 and 3⁄8-in. shanks.
M. K. Morse Co., Box 8677, Canton, OH 44711, (330) 453-8187, mkmorse.com