The GFRF1F2 series is a line of roller-type freewheels manufactured by Stieber. It is a self-contained, sealed and bearing supported by two 160 series of bearings. The series applies the GFR base module as described on the manual.
However, the bearings need to be oil-lubricated prior to use, if they are shipped disassembled. The units are initially utilized as overrunning or indexing clutch. The F2 cover is applied to close the bearing. In addition, the series comes with 3 screws for oil filling, drain and level.