... Deep groove ball bearings description:1. Material: Gcr15 Chrome steel, Stainless steel or Carbon steel2. Brand: TINMY3. High quality with very smooth ... ,6300,6400,51100,51200,51300,51400,DAC,BC, etc.Ring MaterialChrome Steel ,Carbon steel,Stainless steelTolerance gradeGB/T307.1- ... gland6.Noise inspection7.Appearance inspection8.Rust prevention9.Product packaging High quality deep groove ball bearings