10-Pack 6906ZZ 30x47x9 Shielded BearingBall Bearings 6906ZZ 30 x 47 x 9 mm Lot of 10 Bearings 10 Ball Bearings the inner diameter is 30, outer diameter is 47 and the width is 9, a standard bearing size commonly used in a variety of industrial and commercial applications, Made from high strength chrome steel for durability and performance and can rotate up to 19000 rpm, each Comes with double metal shields (ZZ) to keep out dust and dirt, additionally, these bearings come pre lubricated with