3/8" Half Bullnose Profile Granite Router Bit B10 Free 1-3 days expedited shipping by USPS Diamond half bullnose or quarter round over router bit for cutting and shaping the edge of granite or other stone slabs Coarse grits for fast cutting 5/8-11 standard mounting thread for grinders and polishers Good for both wet and dry cutting with water feeding holes included in larger bits Cut 1/4 circle of 10 mm or 3/8" radius; metal guiding ring for long lasting