15x21x4 Open Bearing15 x 21 x 4 Open Ball Bearing One Bearing 15mm x 21mm x 4mm Open Wheel Ball Bearing for many applications, a standard bearing size with dimensions commonly used across many industries: 15mm x 21mm x 4mm. made from durable 52100 alloy steel, commonly known as chrome steel. 15 x 21x 4 Ball Bearing Deep Groove Ball Bearing Closures: Open Size: 15mm x 21mm x 4mm Inner Diameter: 15mm Outer Diameter: 21mm Width: 4mm Quantity: 1 Bearing
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