This is a 1 g weight bushing in one block which allow axle alignment wihout transversal flexion chassis issue in AngleWinder applications.
Another important advantage is the permanent lubrication by centrifugal force with oil remaining under the tube.
It is important to use perfectly straight axles as our references SLPL 2250, 2252 and 2255 !

References are :

SLPL 1010 Combi Plus 31.0 mm
SLPL 1011 Combi Plus 31.6 mm