Powlab 5 Pc. Counterbore Set For Copper, Aluminum, Steel, And, M8 End Mills. Product Details An essential hardware tool for industrial. Specifications: Material: High-speed steel. Drill Quantity:5pcs. Drill Size: m3, m4, m5, m6, m8. Package Weight: Approx.130g /4.6oz Package List: 5 * Counterbore End Mill Mill cutters are made of hard high speed steel, usually used to be assembled on milling machine. It includes 5 sizes in one counterbore set(m3, m4, m5, m6, m8).Please refer to the size chart for detailed data. High toughness, abrasion resistance, high-speed cutting for the high hardness. Reduces times of changing tools, improves machine actuator movement efficiency and save mold making time. Suitable for milling of copper, aluminum, steel, cast iron, etc.An essential hardware tool for industrial. 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.