Extended Core Bits for Marble and Limestone

6" long core bits designed for drilling the mounting holes in masonry, marble, limestone, and concrete (countertops only). Can be used dry for masonry and soft stone such as marble and limestone. Wet drilling recommended for concrete (countertops only). 1/2" shank adapter for chuck drills is sold separately below. Segment Height: 8 mm Drilling Depth: 6" Arbor 5/8"–11 thread Equipment: Hand held drills Drilling Method: Wet and dry