30/8ZZ Angular Contact Track Roller Bearing 8x22x11mm30 8ZZ Angular Contact Shielded Ball Bearing One Bearing 8x22x11mm 30 8ZZ Angular Contact Shielded Ball Bearing, made from durable 52100 alloy steel, commonly known as chrome steel, each bearing has 2 Metal Shields to protect the bearing from dust or any possible contamination, this is self lubricated bearings (bearing is already greased). Size: 8 x 22 x 11mm 30 8ZZ Double row Ball Bearing Quantity: 1 Bearing Shield Double metal shields (ZZ) Inner