... BearingsOil bearings, oilless bearings, bushing bearings, bearing shaft/block. 4 Aluminum Die CastingsAluminum die casting parts, aluminum shaft ... . All-round testing equipments: 2.5d profile projector, Rockwell hardness tester, Metallographic measuring instrument, gear beating detector, beat ... and returns: We provide 1 year warranty. We test every product before ship to guarantee 100% working. ...