Heavy duty steel body core drills with diamond dust cutting segments. Ideal for dry cutting clean holes in masonry. Use with 1/2″ BSP compatible arbors and drills equipped with a safety clutch. Do not use with drills set in hammer action. Heavy duty steel body core drills with diamond dust cutting segments. Ideal for dry cutting clean holes in masonry. Use with 1/2″ BSP compatible arbors and drills equipped with a safety clutch. Do not use with drills set in hammer action.