Features: The DURO BASE 3 piece core kit is supplied in a durable aluminium case with moulded foam liner to protect your drills when not in use & a shoulder carry strap for easy transportation. DURO BASE core drills utilise high temperature brazing techniques attaching the segments securely to a castellated high tensile steel core. Benefiting from high concentrations of large synthetic diamond grits, these drills perform well above the industry standard for this level of drill with good life times and free cutting characteristics. Designed to  cut most medium-hard to soft masonry materials such as Hard York Stone, General House Bricks, Lightweight Concrete Blocks & Breeze Block. This core set really does provide universal use in the construction industry, giving exceptional cutting in almost all applications.