The Grainger Approved Square End Mill Single End is a high-speed steel end mill with a square end for milling slots, keyways, and pockets. It has a 1/2" shank diameter, 1-1/2" overall length, and 1/2" cutting diameter. The end mill has 4 flutes and a right-hand spiral. It is uncoated and made in the USA. The end mill can be used for slotting, side milling, and facing on low carbon steels at surface speeds up to 120 SFM.