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 straight shank and is uncoated with an overall length of 2-1/2", shank diameter of 1/2", and flute length of 1-1/4". This end mill provides accurate cuts in steel, aluminum, and other non-ferrous materials. The square end allows plunging into workpieces and machining of pockets with square corners and edges. It is designed for use on CNC or manual milling machines.