laser diamond core bit laser or brazed Model TK- B Type Application:For drilling reinforced concrete with steel. Diamond core ... bitlaser or Brazed welded core bits Model:TK- B type ,Application: For drilling cured concrete,reinforced concrete with steel ... .0x74503020x5.0x75003220x5.0x75503520x5.0x76004020x5.0x7 laser diamond core bit ,TK-B type