A kit of premium dry core bits with spiral barrel designs for swift dust removal. Features of the bits include a fast start segment, side vents and a spiral barrel design to help keep bits cool masonry, brick, concrete with light or medium steel reinforcing. Also effective for granite, marble and stone. Core kit includes: 38mm, 52mm, 65mm, 117mm & 127mm Spiro Cores, SDS Adaptor, Hex Adaptor, Drift Key, 1/2” BSP Extension (200mm), A-Taper Pilot Drill in a heavy duty carry case.