Single pin sight with quick-change pin technology allows you to change pin size and color in seconds. Dovetail mount provides more adjustability and easy sight removal for travel. Features adjustable 2nd and 3rd axis, rear facing yardage tape, and an adjustable long range yardage stop to set your maximum sight travel. Includes 010" and 019" pins with green, Red, and Yellow fibers. Micro push-button sight light and over 60 pre-marked yardage tapes are also included. Aperture size: 1.87". accepts covert lens kit (sold separately.).