Check the listing for details. 5 PCS 1/8" 4 Flutes Square 45° Helix Carbide End Mill Bits AlTiCrN Coated HRC 50. Condition: New. Listed at 25.00 USD. Free eBay listing template designed by dewiso.com General Usage : Applicable with copper, copper alloys, cast iron, steels, carbon steels, alloy steels, pre-hardened steels, hardened steels, and stainless steel materials.Best use for materials HRC less than 50. AlTiCrN Coating : Aluminum Titanium Chromium Nitride (AlTiCrN)offering better heat resistance than TiAlN, TiN or TiCN coatings. It is able to provide high wear resistance, lubricity, exceptional oxidation resistance, extreme hardness, and excellent abrasive wear resistance. It has higher re liability in Dry operations, heat resistance, hard machining, and the resistance can be reduced. 4 Flute Cutter: It has uniqe geometry and strong cutting edge. 4 flute is great for speedy cutting. Ideal for planar, step, groove, forming surface while the 45 degree helix design can perform smooth surface finish, better chip removal control than those with lower helix degree. Cutting Diameter Tolerance : high accuracy with an error of -0.02mm Contact us We can be contacted at any time through eBay messages if you have any questions, comments or product requests. We will respond to you within 24 hours and do our best to help you out! We encourage our customers to contact us with any questions or concerns! We'd like to be sure you are completely satisfied with your purchase.