The adjustable green insert has three settings. Performs well in low-light conditions. Easy to mount and adjust. Includes tubing for proper positioning. 3⁄16" aperture.
Decided to try a different peep sight. This looked to be a good choice. Easy to install and align. Examining before installation I had doubts about the sliding aperture on the shooter side of the sight. I was planning on gluing it to the sight, forgot and started putting some arrows through my bow. After half a dozen arrows the sliding plastic aperture was gone. Bottom line not a bad sight, just a dab of glue prior to shooting will keep the rear aperture from flying off. Still shooting good groups without it, but expected a better quality product.