This is the Replacement Bearing for the OS Max RZ series engines. This bearing will fit the following engines: .21RZ-M .21RZ-B .21RZ-B(P) .21RZ-R(P)

FEATURES: Hardened steel bearing w/7 balls. The bearing also features a plastic ball retainer, and a front rubber seal.

INCLUDES: One Front Ball Bearing.

SPECS: Outer Diameter: 19mm Inner Diameter: 7mm Thickness: 6mm