... cutting tools in China, Annular cutter (core drill) is the very product developed and produced by ... our company. Annular cutter, hole saw, step drill and rail cutter are our main products.Our ... markets,OEM available from us. 1. TCT annular drill, 19.05mm universal shank for clamping strength and ... process of annular groove on various magnetic drills and press, like Alfra, Hougen, Jancy, Euroboor, BDS, ...