Detailed Product Description handle door lock(2) Raw materials are high-qualityzinc alloy material, to ensure the quality stability.(3) Zinc rod through the latheprecision machining, cutting, drilling, and production thread(4) Through the multi-channelpolishing process, so that the surface bright, if any scratches and defectshave to be re-polished. (5) 20 with a few strict quality controltesting, ...