... GB10595Certificate: ISO, CEType conveyor DTII, TD75,TR,DX.Bearing NO: 6204/6205//6306/6307/6308 etcMaterial: carbon ... ,FAG,NSK-----------------------------------------------------Roller inner structure and material:Tube: carbon SteelShaft: bright drawn steel to required bearing toleranceShaft ... are simultaneously machined and chamfered.Bearing: ouble row deep groove ball bearing 2Z and 2RS with C3 ...