Cheap And Discounts 1Pc D25mm-50mm Diamond Core Drilling Bit Wet/Dry Granite Core Drill Bit M14 or 5/8-11 Thread For Granite Marble Porcelain Tile Wholesale. Buy Directly From Merchant Diapro Tools Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.