11.5x21x5 Full Ceramic Silicon Nitride Bearing11. 5 x 21 x 5 Full Ceramic Ball Bearing Silicon Nitride One Bearing 11. 5 x 21 x 5 Full Ceramic Ball Bearing, measures an inner diameter of 11. 5mm, outer diameter is 21mm and the width is 5mm, Bearing is made from Ceramic. 11. 5 x 21 x 5 Ball Bearing Full Ceramic Ball Bearing Cage Material: PTFE (Polytetrafluoroethylene) Balls: Si3N4 Ceramic(Silicon Nitride) Inner outer races: Si3N4 Ceramic (Silicon Nitride) Size: 11. 5mm x 21mm x 5mm Inner
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