Excellent and super easy to use replacement for those irritating wingnuts on cymbal stands which always seem to undo themselves and can be fiddly when setting up or breaking down the kit in a hurry.
The clamp uses an internal spring to hold it in position wherever you want to place it on the cymbal mounting nut, to give the exact amount of cymbal swing you want.
Price is ok, but the look and feel of the plastic is cheaper than I was expecting from someone like Sonor (hence the mark down to 4 stars for quality), and perhaps not as nice looking "in the flesh" as the Tama alternatives.