R18ZZ Shielded Bearing 1-1/8" x 2-1/8" x 1/2"R18ZZ Shielded Ball Bearing 1 1 8" x 2 1 8" x 1 2" R18ZZ Shielded Ball Bearing, bearing is made from Chrome Steel, bearing has 2 Metal Shields to protect the bearing from dust or any possible contamination, this bearing is self lubricated (bearing is already greased). R18ZZ Ball Bearing Deep Groove Ball Bearing Shield Double metal shields (ZZ) Quality: Electric Motor Quality Dimensions: 1 1 8" x 2 1 8" x 1 2" inch Inner Diameter: 1 1 8" inch Outer