... StandardFeatures:1)Tolerance : ABEC-1,ABEC-3,ABEC-5, ABEC-72)Vibration Level : V4,V3,V2,V13)Cage: Brass,Nylon4)Hardness ... 4.Rotary Test 5. Greasing and gland 6. Noise Inspection 7.Appearance Inspection 8. Rust Prevention 9.Product PackagingService:We will ...