OEM GG20/GG25 Cast Iron Belt Pulley 1)material:gray iron GG20,25,30 2)technics:sand ... has been carried out during the entire process of manufacture with the assistance of computer and other numerical control equipment, which ... strength tester, Hardness tester, Roughness tester, deflection tester, Impact test machine, Projector, Altimeter, Scale Micrometer, pressure tester, etc.DeliverySample sent to ...