... , China (Mainland)Material: chrome steel, carbon steelcage: Steel ,nylon ,brass ,bronzeroller: Carbon ,bearing steel,chromium steel,etcclearance: C0 C2 ... 100-320mmMaterial:bearing steel; chrome steel;stainless steelCage:Steel ,nylon ,brass ,bronzeClearance:C0,C2,C3,C4,C5Precision Rating: P0, ... test 3.Cleaning 4.Rotary test 5.Greasing and gland 6.Noise inspection 7.Appearance inspection 8.Rust ...