6711ZZ Thin Section Shielded Bearing 55x68x7mm6711ZZ Shielded Ball Bearing 55mm x 68mm x 7mm 6711ZZ Shielded Ball Bearing, Bearing inner diameter is 55mm, Bearing outer diameter is 68mm and Bearing width is 7mm, 6711ZZ bearing is a popular size that could be used in many RC Cars and Trucks, 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.