HANGZHOU GSR-THREADS CO.,LTD, manufacturer of high quality "Threads cutting tools" and "Threads repairing tools" like TAPS, DIES, WRENCHES, and SCREW EXTRACTORS etc,follows the Quality idea with more than 100-year history from GSR Germany, with nearly 10-year researching and developing in China market, we have built up several professional production lines and with more than 250 workers in our ...