5Pcs 5/16" Carbide Square End Mill For Steels, Hrc 55 Deg, 4, Metal More Product Details APPLICATION -Smileray Carbide end mills can be 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. AlTiN Coating: AlTiN, with high aluminum content provides excellent hot hardness and oxidation resistance. HIGH-PERFORMANCE MATERIAL - Smileray Carbide end mill for steels is made from micrograin carbide, which gives it exceptional toughness, durability, and machinability. End mill can perform brilliantly and a excellently value. Highly optimized carbide and coating pairing means superior wear and chipping resistance in your cutting applications. CUSTOMER CARE: Smileray high quality milling tools will be a good helper at work. If any product problems upon receiving, please let us know. We will help you within 24 hours. Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.