Dry Diamond Drill Bit Set - Focstol 10Pcs, 6Mm*2+8Mm*2+10Mm*2+12Mm*2+6Mm*2 Product Features ?Size?Totally 10pcs/set: Diameter 8pcs 6/8/10/12mm drill bits+2pcs 6mm carbide drill; total length 65mm; diamond height 8mm; diamond grit #50/60; round shank ?Application?Suitable for dry or wet drilling in Porcelain Ceramic Tile Marble Granite Artificial Stone Quartz, etc. Wet using will prolong the working life. Round shank design for stable clamping, smooth and easy drilling ?Cooling Wax Vacuum Brazed Technology?The inside of drill bits are filled with cooling wax, help heat dissipation and chip evacuation. Vacuum brazed technology and high-quality diamond grains ?Cross Helix Carbide Drill?Cross Helix Carbide Drill sloves the problem of diamond bit drifting and walking. Provide more precise positioning and easier drilling ?Recommended Machine?Corded Drill, Cordless Drill, Benchtop Drill. Use electric hand drill: Recommended speed not less than 2000RPM; Faster the RPM, longer the drill bit's working life. When use Angle Grinder, please install angle grinder drill chuck 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!