1, ISO9001:2008 CERTIFIED. 2, Different kinds of gears, worm gears,Module from M1-M8 3, Material:C45, 40Cr. 42CrMo. GG25, ... 316L. 1, ISO9001:2008 CERTIFIED.2, Different kinds of gears, worm gears3, Standard and non-standard4, Material C45, 40Cr. 42CrMo ... degree RH/LH.We can offer you all kinds of gears(spur gear, bevel gear, sprial gear, internal gear, sprocket, chain wheel ...