Premium Quality. Reliable Performance. Trusted Brand. Dart Red Ten, 10 Piece Spiro Diamond Core Kit In Case. 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. Item must be in original condition with all accessories included. Thank you for shopping with us! We appreciate your business.