I believe this is some type of spacer but I am not sure that this is its only function.
Can someone tell me what exactly this collar does, there is a ring welded in the center and on one side of the ring it is ribbed and on the other side it is smooth.
Where are they available to buy, I tried a few places on line but no one has one for sale.

In a rear brake drum diagram it is #5

thanks, Troye

I believe this is some type of spacer but I am not sure that this is its only function.
Can someone tell me what exactly this collar does, there is a ring welded in the center and on one side of the ring it is ribbed and on the other side it is smooth.
Where are they available to buy, I tried a few places on line but no one has one for sale.

In a rear brake drum diagram it is #5

thanks, Troye