Shdiatool Diamond Drill Core Bits 3/4-Inch Hole Saw Cutter For, 11 Angle Grinder Product Details Serrated Design: diamond hole saw has saw-shaped teeth on the top to ensure sharp teeth and fast drilling speed. The openings between the sawteeth are neat, and there are multiple chip removal grooves, which can quickly discharge dust during the drilling process and is not easy to block, thus improving the work efficiency. The core bit is designed for Drilling a hole to porcelain tiles, ceramics, marble, granite, stome,etc. Diameter 19mm(3/4"), 5/8"-11 connection, diamond height 10mm, total length 60mm, diamond grit #35/40; the recommend speed is 6000rpm, the max speed is 11000rpm Advanced technology: All brazed hole saws are treated by a special high-temperature resistant process. they can withstand the huge heat generated by the hole saw when it rotates at high speed. Water can be an additional coolant to extend the service life. Vacuum brazed technology provides excellent drilling strength for high-precision and smooth cutting, and the drilling is stable and fast. The hole saw is easily operate on 5/8"-11 Angle Grinder; Need an adapter for drill or other machine, such as SDS,hex,Round plus shank 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.