MR688-ZZ-W6 Ball Bearing Double Shielded ID 8mm OD 16mm Width 6mmMR688 ZZ W6 Ball Bearing Single Row Deep Groove 8mm x 16mm x 6mm Double Shielded Miniature Radial Bearing The MR688 ZZ W6 is a compact single row deep groove ball bearing with double metal shields for protection and durability. With a slightly wider 6mm profile, its ideal for hobby motors, small robotics, and other high speed, space sensitive applications. Type: Deep groove radial ball bearing Size: 8mm x 16mm x 6mm Inner diameter (ID): 8mm (. 315")