This is a AHZ front engine bearing (7x19x6mm) dual rubber sealed. This bearing fits most of the major popular .21 engines, such as, O.S., RB, Novarossi. This bearing is rubber sealed to help prevent front engine leakage. package contains two bearings.
Recommendation For Dual Front and Rear Seals:
Our bearings come with dual rubber seals. Noraml installation would be to install with both seals intact. We do recommend that you remove one of the seals, and place the removed side of the beaing towwards the internal portion of the engine.This helps insure that the bearing stays lubicated.