That's right... a name you have come to know and trust for quality products has once again come up with a revolutionary new peep sight. This peep sight is designed to work in low light as well as bright sun light conditions. The Ultra-Glo peep sight works on bows with 30 to 60 degree string angles, great for short axle bows. The peep is ambient lit at 4 points around the 3/16" aperture hole. These points are adjustable in 4 settings from bright sun light to low light for those peak hunting times. When installed, the revolutionary design prevents the peep from being knocked out of alignment, thus maintaining accuracy in those hunting situations.