uxcell 688-2RS Deep Groove Ball Bearings 8mm Inner Dia 16mm OD 5mm Bore Double Sealed Chrome Steel Z2 4pcs: Amazon.com: Industrial & Scientific
688Z Ball Bearing 8mm x 16mm x 5mm 3D Printer Accessories Double Shielded Deep Groove Bearings for V Slot NEMA 23 Motor L inear Guide Silver Metal Pack of 10: Amazon.com: Industrial
Amazon.com: ZHENGGUIFANG Professional 688-2RS 688 RS Bearing 10PCS 8x16x5mm for RC Motor Double Sealed Orange Miniature Ball Bearing 688 2RS (Size : 688RS) : Toys & Games