Milwaukee 48-20-5145 - SDS-Max and Spline Thick Wall Carbide Tipped Core Bit 3 in.Milwaukee's SDS Max and spline thick wall core bits are used for drilling large through holes into brick, block, concrete. Includes core bit, guide plate, and centering pin. Features Thick wall design 3 in. diameter Usable cutting depth 4 1 16 in. Use with 12 in. or 18 in. spline adapter shanks (48 03 3564, 48 03 3565) and 12 in. or 18 in. SDS Max adapter shanks (48 03 3572, 48 03 3573) Use with 7 1 2 in. extension 48 95 6085 Use with guide plate 48