This just barely fit the dropout of a Specialized Crosstrail but works well otherwise. For another bike, I had to put a thick washer or two under it to clear the seat stay. This negated the anti-rotation feature of the provided washer with the tab (the tab is supposed to hook into the notch on the bike's dropout or similar to prevent the coupler from rotating). To prevent rotation I tightened up the axle nut so the coupler would not move.
The pin rattles a bit, but two rubber washers cut from a bit of inner tube took care of that problem.