Watris Veiyi 5Pcs Counterbore Drill Bit Set, Hss-Al Straight Shank 4 Flutes End Product Details Specifications: Material: HSS-AL super-hard high speed steel Hardness: HRC65~68 Size:(Boot*Blade Diameter*Shank Diameter*Full Length) M3=3.2*5.9*6*45mm M4=4.2*7.4*6*48mm M5=5.2*8.9*6*51mm M6=6.2*10.4*8*58mm M8=8.2*13.4*10*67mm Weight: 128g(approx.) Package Includes: 1 Set(5pcs) x Countersink Mill Cutters Note: 1. Please allow 1-2mm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. ?High Speed Steel?Made of HSS-AL hard high speed steel, with high toughness, abrasion resistance, high-speed cutting for the high hardness. ?Professional Tool?Mainly used to cut holes that allow bolts or screw heads to be screwed into. Can be processed directly or finely processed to the heat treatment tool. ?High Alignment Precision?The end mill cutter cuts hole and bottom hole with high alignment precision. Due to its high production efficiency, it is commonly used in the machining industry. ?Improve Efficiency?Reduce the time of changing tool, improve the efficiency of machine actuator movement, and save tool making time. ?Widely Use?Countersink drill bit set is suitable for grinding copper, aluminum, steel, cast iron, etc. Usually used for assembling on a milling machine. 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.