Sali Wet Diamond Core Drill Bits 8" (205Mm) Diameter, 15" (380Mm) Drilling Product Details Diameter: 8"/205mm, Inside barrel depth(drilling depth): 15"/370mm,thread type: Industry standard 1-1/4-7"(please note:1-1/4"-7 thread size come without any adapters) Versatile uses: Our concrete core drill is designed for drilling concrete, red brick, tile masonry, rebarr reinforced?asphalt?marble, rock, stone and other materials on conditions, such as installing air conditioners, pipes, stair railings, highways, and airports, etc Simple operation:The core drill can be used wet only . Start drilling at the vertical position and continue to dig deep. Water can prolong the service life Efficient smooth drilling: This diamond core drill comprises premium aluminum alloy components, and high-quality diamond grits ensure longer coring life recommended to use with handheld core drills or dedicated core drill rigs Humanized structure: Our diamond wet coring bit features chip removal holes, highly regular saw teeth, and concentric axes design. The innovative design allows it high drilling performance while keeping a long lifetime 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.