This Faithfull Diamond Core Drill Set offers a professional quality 1/2in BSP threaded core tipped, with premium 8mm turbo cut diamond segments. They are manufactured to offer exceptional wear and speed of cut. The 'V' groove segments assist in clearing debris when in use.A robust case ensures best storage practice to keep your cores in prime condition. They are ideal for use in plumbing, electrical, and general building installations to cut clean holes in brick and concrete blocks. The 7 piece kit contains the most popular core sizes used in the UK. Set contains:3 x Diamond Cores with 8mm Turbo Segments: 38mm, 52mm, and 117mm.1 x SDS Plus Extension Adaptor 10mm x 200mm.1 x Hex Extension Adaptor 12mm x 200mm.1 x A-Taper Pilot Drill 10mm x 200mm.1 x Extractor Drift Key.1 x Carry Case. ROTARY USE ONLY – Must not be used on Percussion/Hammer mode. DO NOT USE DIAMOND CORES LARGER THAN 78mm IN DIAMETER WITH SDS-plus DRILLS AS THIS MAY RESULT IN DAMAGE TO THE POWER TOOL OR SDS ADAPTOR. Diamo