Use a conventional rotary drill motor for core drilling. FAST | EFFECTIVE | PRECISE Specifically designed for New Zealand masonry, brick and block. All core bits are 150mm long and come with Female ½” BSP thread. The case contains 3pc Dry Core Drill bits: 38mm, 52mm, 65mm.(The 2 empty section in the case are for optional extra core bits which can be purchased separately, sizes range from 26mm to 172mm). Machine adaptors included: SDS+ (short & long), Hex (short & long), drift key, masonry pilot drill, Taper Pilot guide. Additional adaptors available: SDS Max (short & long). Laser welded in NZ, do not use with hammer action, rpm rage, machines over 1kW, speed range 1000-3000rpm