Silverline 28, 52 & 107mm Diamond Core Drill Kit 3-Core 7pce 868543. Heavy duty steel body with diamond dust cutting segments For dry cutting of accurate holes in masonry Includes 3 core drills (28, 52 and 107mm), 2 arbors (SDS Plus and hex), guide drill bit and drift key For use with drills equipped with a safety clutch Do not use with hammer action.