This Cardi Three-speed hand-held core drill rental has an electronic clutch with a powerful 18 amp motor. It has a 5 inch bit capacity and we rent a variety of bit sizes. It must be run with water. It can even go through concrete with rebar in it. If you do not have access to water on the jobsite you can just fill 5 gallon bucket with water and use garden hose style pump to supply water to drill. There is also a 12-inch extension available for deep drilling. Sometimes referred to as a cement drill, hammer drill, concrete drill or concrete boring tool or a concrete masonry hole saw or a concrete hole saw or coredrill or concrete hole drill or a wet core or a core machine or whole saw for cinder block.