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STARTS THE HOLE EXACTLY WHERE YOU MARK IT: The taper shank taps into the seat inside a Marcrist core drill adaptor and centres the core bit from the first turn, so the cut begins on your mark instead of skating across the face. FITS THE HEX CHUCK AND SDS PLUS ADAPTORS: One pilot drill covers both Marcrist 1/2 inch BSP adaptors, the hex 3 jaw chuck version and the SDS plus version. A drift key, sold separately, taps it back out when the job is done. NO HAMMER ACTION NEEDED: Marcrist pilot drills are designed to work without hammer, which saves setting up time and is easier on the diamond core, so run the machine in rotary and let the core do the cutting. THROUGH HARDENED STEEL FOR HIGH TORQUE: Hardened right through for consistent strength, the tough steel body takes the torque of core drilling and stands up to demanding professional use on site. 10MM x 225MM FOR DRY CORE DRILLING: Cuts the pilot hole in brick, concrete, mortar and stone. For dry core drilling only, not for wet drilling systems. Recommended for installers, building professionals and electricians.