"stoppers" or "toe stops"
The standards stoppers with a bolt that is crossing all the stopper to tight in the plate and adjustable ones with whe axle integreated to the stopper to tight and adjust in the plate.
With the adjustables,be careful to European ones (ROLL-LINE), they don't fit US plates (thread is not the same)
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Dancing Jam Plugs 5/16 for rollerskates