GG20/GG25 Sand Casting V Belt Cast Iron Pulley 1)material:gray iron GG20,25,30 2)technics:sand casting ... 4)OEM GG20/GG25 Sand Casting V Belt Cast Iron PulleySpecification:Materials: gray iron HT200 and HT250Surface finish: polishing, anodizing, ... strength tester, Hardness tester, Roughness tester, deflection tester, Impact test machine, Projector, Altimeter, Scale Micrometer, pressure tester, etc. ...