The faithfull faidckit7 7 piece diamond core drill kit for cutting clean holes in brick and concrete blocks they are ideal for plumbing electrical engineering installation and general building tasks all cores are 12 inch bsp threaded with 8mm turbo segments set contains3 x diamond cores with 8mm turbo segments 38mm 52mm and 117mm1 x sds plus extension adaptor 10mm x 200mm1 x hex extension adaptor 12mm x 200mm1 x a taper pilot drill 10mm x 200mm1 x extractor drift key1 x carry case rotary use on