Bearing 2x5.8x2.5 - Shielded - Miniature2 x 5. 8 x 2. 5 Shielded Ball Bearings 1 Ball Bearing 2 x 5. 8 x 2. 5 Shielded Ball Bearing, made from durable 52100 alloy steel, commonly known as chrome steel, each Comes with double metal shields (ZZ) to keep out dust and dirt, plus its pre lubricated with grease so its ready to roll right away. 2 x 5. 8 x 2. 5 Ball Bearing Deep Groove Ball Bearing Shield Double Metal Shields for dust protection (ZZ) Lubrication: Pre lubricated with grease