... manufacture of cutting tools in China, Annular cutter (core drill) is the very product developed and produced by our ... Alfra, Hougen, Jancy, Euroboor, BDS, Ruko.3. Can be used on various materials, like steel plate, Copper, aluminium, cast iron ... industry of annular cutters production.Product applicationOur product is mainly used to steel structure project, rail way traffic, bridging, shipbuilding ...