The 1/4" 3 Flute HSS Hollow Mill (UE-9-L-6) is a high-quality end mill designed for metalworking. Made of high-speed steel with a single end design, this hollow mill features 3 flutes and a 1/4" diameter. With an overall length of 1-1/8 inches and a length of cut of 1/4 inch, this product is ideal for precision milling and finishing.