The product featured is a complete high performance and quality rebuild solution, for the Dolomite 1850 Early (Three Rail) Gearbox Unit. The rebuild kit is equipped with the necessary bearings, gasket and oil seals required to rebuild the unit. The package contents are the following: 1x Constant Mesh Pinion Bearing, 1x Main Shaft Front Bearing, 1x Main Shaft Rear Bearing, 1x Main Shaft Extension Bearing, 1x Lay Roller Packet (Enough for 1 Lay gear), 1x Lay Shaft, 1x Spring and Ball set (for all gears), 1x Oil Seal Set, 1x 3 Rail Overdrive Gasket Set (J & D type). Please note we only use high quality branded bearings ensuring that our products are high in quality and performance.