This Faithfull 11 Piece 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 cores in prime condition. The core drill set is ideal for use in plumbing, electrical, and general building installations to cut clean holes in brick and concrete blocks. The kit contains the most popular core sizes used in the UK. Set contains:5 x Diamond Cores with 8mm Turbo Segments, Sizes: 38, 52, 65, 117 and 127mm.1 x SDS Plus Extension Adaptor 10 x 115mm.1 x HEX Extension Adaptor 12 x 88 mm.1 x SDS Plus Extension Adaptor 10 x 240mm.1 x HEX Extension Adaptor 12 x 240mm.1 x A-Taper Pilot Drill 10 x 200mm.1 x Extractor Drift Key. 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. Diamond Cores give the best results when used with a purpose-built core drilling machine.