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S6904 Bearing 20x37x9 Si3N4 Ceramic Stainless Steel Sealed ABEC-7 Bearing Linear Motion Systems - 5/8 inch (0.625") S61902 Open ABEC-3 Stainless SteelS6904 Open Ball Bearing ABEC 7 Quality with Si3N4 Ceramic Balls (Silicon Nitride) 20 x 37 x 9 mm S6904 Open Stainless Steel, radial and deep groove ball bearing,bearing is made from stainless steel with Ceramic Balls (Si3N4) and Nylon cage,the quality is set to EMQ (ABEC 7 quality) to ensure high speed,inner diameter is 20mm, outer diameter is 37mm and width is 9mm S6904 Ball Bearing Deep Groove Radial Ball Bearing Closures: Open Quality: ABEC 7 Cage: