Watris Veiyi 5Pcs Counterbore Drill Bit Set, Hss-Al Straight Shank 4 Flutes End 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. Product Features ?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. Shipping: Shipping is complimentary within the lower 48 US States. We Do Not Ship to PO/APO Boxes, HI or Alaska We Do Not Ship Outside of the Continental US All items ship within 24-72 hours of Payment For large items that require Freight shipping a valid phone number is required to call and schedule your delivery Terms of Sale and Feedback: Feedback is extremely important to us and If you are satisfied with our transaction, please take a moment to leave Positive Feedback. YOUR Satisfaction is our #1 Priority! If there are any issues, PLEASE contact us BEFORE leaving a neutral or negative rating so that we may resolve any concerns. We PROMISE we can make you happy if you give us a fair chance. Returns / Concerns: All items qualify for returns within 14 - 30 days of receipt. Buyer is responsible for return shipping on any item that is not damaged Please be sure this is an item you want before making your purchase. Customer Satisfaction is our TOP priority! All items are IN STOCK at time of listing. Inventory changes constantly and it is impossible to maintain a perfectly accurate count of all items. Please do not penalize us if we have to issue you a refund! Thank You For Your Business!