pLACKMOND ppOur CR series PreStressed core bits are engineered with our highest quality diamond bond and a crownstyle cutting rim for a fast, clean cut in concrete that has a high steel concentration, prestressed concrete or where steel mesh is used The cutting rim is designed with small gaps which prevent the bit from snagging on pretensioned cables or wire mesh The small gaps also allow water to escape the bit and keep the cutting rim sharp and coolp