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 resulting in longer life. Suitable for use in 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.