1/8" 3/16" 1/4" 5/16" 3/8" Carbide End Mills Set - Solid Carbide, Tisin Coated Product Details sisona End Mill Sets -- Cutting Diameter: 1/8 - 3/8 inch?1/8" 3/16" 1/4" 5/16" 3/8"??Shank Diameter:1/8 - 3/8 inch?1/8" 3/16" 1/4" 5/16" 3/8"??Cutting Length:3/8 - 1 inch?3/8" 5/8" 3/4" 13/16" 1"??Overall Length:1-1/2 inch - 2-1/2 inch?1-1/2" 2" 2-1/2" 2-1/2" 2-1/2"? Applicable Materials: cnc bits usually used for steel?Carbon steel/Alloy steel/Hardened steel/Cast lron, etc.? Wide Compatibility: sisona 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. High Quality:made from solid tungsten carbide (TC)?have a Titanium Nitride (TiN) surface to improve heat resistance and reduce wear. Used it strictly for steel, it worked great for that, eats metal fast ?beautiful surface finish!Watch your stick out and travel speeds. 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.