8 inch core slug and core bore bit

Here are an 8-inch core slug and the core boring bit that cut a hole for a plumbing pipe on Brevard St in Charlotte North Carolina. This is an 8-inch wall that the core bit handled easily. With only one piece of 1/2 inch rebar in the slug, the drilling time took about 6 minutes, which was welcomed relief because previously the reinforced concrete supporting walls on this project had fairly heavy rebar embedded in the concrete for strength.