1/4" Carbide Roughing End Mill - 4 Flute - 1/4'' Shk Dia, 2-1/2'' Oal - For sisona Carbide Roughing End Mill -- Cutting Diameter:1/4 inch,Shank Diameter:1/4 inch,Cutting Length:3/4 inch,Overall Length:2-1/2 inch High Quality:made from solid tungsten carbide (TC)?have a Titanium Nitride (TiN) surface to improve heat resistance and reduce wear. Applicable Materials:usually used for steel?Carbon steel/Alloy steel/Hardened steel/Cast lron, etc.? Wide Compatibility: sisona Roughing end mill bits are compatible with most desktop CNC machines, as well as other industrial CNC machines. Just make sure you select the correct-sized collet for your device. Suitable for rough machining. High machining efficiency. Good chip removal performance and large chip removal volume. High metal cutting rate. Mostly used for slot machining/step surface machining.