... reliability. Product Specification :Model No: 608RS bearing Size: 8*16*5mm Bearing material: carbon steelProduct Feature:1.Low coefficient ... 60,62,69,68,6000series, and non-standard bearing series,toy bearing series and sport equipment series.Roller:all kinds ... produce miniature deep groove ball bearing or carbon steel, bearing steel, stainless steel, non-standard bearing and injection molding roller ...