Bearing 8x19x4 One Shield MiniatureBall Bearings 8mm x 19mm x 4mm One Bearing One ball bearing, a standard bearing size with dimensions commonly used across many industries: 8 x 19 x 4mm. This ball bearing is made from Chrome Steel, and is Metal Shielded from both sides. Double Shielded Ball Bearings Size: 8mm x19mm x 4mm Deep groove ball bearings Material: Chrome Steel Closures: One side Shield Quantity: 1 Bearing