ZSHJGJR Archery Recurve Bow Sight Single Pin Sight 0.019" Fiber Optical 1 Pin Sight for Hunting Bow Sight Accessories

I was sceptical but went ahead and bought one anyway. Glad I did. I used their thickest site washer, and this is a very bright dot in dytime outdoors. Will buy again if need arises.

This is actually an Avalon Tec One sight. The size of the aperture is nice and big, but if you want it smaller, it comes with a few O-rings to narrow down the size (but unfortunately also thickens the outline). The fiber optic gathers lots of light and shows a nice precise dot that bright, but not distracting. It lets me focus on the target and not be hunting for the dot.

EDIT: as it turns out the apertures do fit fine, it is just that by default there is already an aperture in it that you can use the provided needle to remove through a hole at the side.functionality is there, fibre optic sight does light up very well. the provided aperture rubber rings are too big to fit the sight so you're stuck with the default, which is quite big, as someone else mentioned about the size of a penny.

Simple sight with an excellent round pinpoint bright dot when used in well lit conditions. It came with a few different shape apertures too.