ITEM NAME:2 Pcs 15 x 28 x 9mm 51102 Single Direction Thrust Ball Bearings J9I2 2 Pcs 15 x 28 x 9mm 51102 Single Direction Thrust Ball Bearings J9I2 Product Name : Thrust Ball Bearing; Type : 51102(8102) Direction : Single Outer Diameter : 28mm/ 1.1" Inner Diameter : 15mm/ 0.59" Thickness : 9mm/ 0.354" Package Content : 2 x Thrust Ball Bearings Material : Carbon Steel Color : As Shown Weight : 45g They are mainly used in automotive industry and machine tool. Single direction thrust ball bearings consist of a shaft washer, a housing washer and a ball and cage thrust assembly, they can sustain axial loads in one direction and thus locate a shaft axially in one direction. Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is +/-1-3 cm..Single direction thrust ball bearings consist of a shaft washer, a housing washer and a ball and cage thrust assembly, they can sustain axial loads in one direction and thus locate a shaft axially in one direction.