Milwaukee Carbide Core Bits are designed for concrete with the use of a rotary hammer drill SDS-Plus, SDS-Max or Spline. Unlike diamond core bits which require a special core drill, the Carbide Core Bits are meant to be used in hammer mode which hit and breaks up concrete while it drills. Carbide bits can be a little more aggressive because of this hammer action so blow out on the back side can be more common. Carbide bits can be run dry unlike diamond core bits which are best used with a flow of water. Some metal or rebar can be handled with the Milwaukee Carbide Core Bits but will dull the bits much faster so best to avoid any metal if possible.