Diamond Tile Hole Saw Kit 10-Pack, Dt-Diatool Diamond Core Drill Bits Set Product Features ?Specification?7pcs core drill bits: Diameter 1/4"(6mm) 2pcs+5/16"(8mm)+3/4''(19mm)+1-3/8''(35mm)+2''(51mm)+2-1/2''(65mm); 1pc 4/5''(20mm) finger bit; 1pc 2''(50mm) beveling chamfer bit; 1pc sds-plus adapter. ?Application?Core drill bits are used to drilling holes; finger bit for enlarging holes; chamfer bit for trimming holes; Dry or wet use. For porcelain ceramic tile marble granite, etc. ?Recommended Machine?5/8" arbor angle grinder. Recommended speed 6000RPM; Maximum speed 11000RPM. sds adapter in this kit can be attached to a drill bit with a 5/8" fitting so that the drill bit can be attached to your drill machine with sds-plus thread. If you are using this kit on a hand drill, make sure that the drilling speed does not go below 2000 RPM. and do not use the impact drill mode. ?Durable and Sturdy?Vacuum Brazed technology provides high efficient working performance and longer service life. ?Save time tool?High quality diamond make drilling less chipping; Drill bits, chamfer bit and finger bit are used together for faster hole shaping and a clean finish. 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!