These superb dry diamond core bits speed up the job of coring walls, whether they are made of brick, stone or concrete. They will even cope with reinforcing bar in concrete. Rugged laser welded construction combined with premium grade diamond and several design features to remove dust from the cutting face, result in a faster working core bit. Sizes are selected to suit modern plumbing, including plastic based pipework and ducting. In stock up to 162mm diameter.