Clutch Drum / Clutch Bell 2-1/8" or 54mm with 12mm x 1.50 threads.
Fits over the 52mm clutch rotor (two shoes & spring) that on the engine.
Note: You can use a pair of neddle nose pliers and a screw drive to remove or tighten.
Used on the Robin Subaru EH025 and the Honda GX22 & GX25, TC200 & TC300 engines and other with the same size of clutch rotor.
Make sure the threads are the same as the matching part, 12mm x 1.50 right hand threads.