... the magical force of magnetic field to make the stainless steel pins rotate very fast, to de-burr, polish and clean the ... small inner holes, inner pipes, crevices, etc. Make NO damage to the surface of workpieces, and DO NOT affect the ... are applied into the industries of horologe, eyeglass, lock manufacturing, ornaments & jewellery, electron, artware, machinery and hardware, etc. Specifications: ...