U Groove Sliding Gate Roller Metal Pulley Hangzhou Dasher Trading Co., Ltd. Base Info Description Pre：Sealed Miniature Ball Bearings MR117 MR117 2RS MR117 Zz Next：AISI52100 Bearing Balls DIN5401 High Chrome Steel Ball High Precision G10 G16 G25 Steel Ball Bearings Gcr15 Metal Balls 1mm-500mm
