10-Pack 688Z Miniature Bearing - 8x16x5mm - Double ShieldedMiniature Ball Bearings 8mm ID 688Z Deep Groove, Shielded, Pack of 10 These 688Z deep groove ball bearings come in a pack of 10 and are designed for compact mechanical systems like 3D printers, small motors, and precision tools. Each bearing has double metal shields and comes pre greased, ready to drop into your project. Type: Deep groove ball bearings Size: 8mm x 16mm x 5mm Bore (ID): 8mm Outer diameter (OD): 16mm Width: 5mm Closures: Double metal