9/64" End Mills | McMasterCarr
WEBJun 10, 2022 · When one end wears out, switch to the opposite end for two times the life of a standard highspeed steel end mill. Made of highspeed steel, these end mills are for general purpose milling in most material, such as aluminum, brass, bronze, iron, and steel. Their square ends make them good for milling square slots, pockets, and edges. All are .