6704 Ceramic Ball Bearing 20x27x4mm Ceramic Bearing

20x27x4mm CERAMIC BALL BEARING engineered with proprietary specific internal race tolerances for high speed reliability. Sealed on both sides as shown. The width of this bearing is 4mm. Overall dimensions of this bearing is 20mm inner diameter, 27mm outer diameter and 4mm width. This bearing has many uses but is very popular as a 5182 Summit differential bearing.  ABEC 7 precision with Grade 5 ceramic balls.