Spuhr's Accessory Ring for the Leupold Mark 4 12-40x60 Tactical Spotting Scope lets you outfit out your scope with a variety of targeting enhancing accessories. Eight interfaces around the ring allows you to attach accessories where they will be the most beneficial and effective. Scope ring allows user to attach: Red dot sight for quickly finding objects, especially in low light Lasers for pointing out targets Cosine indicators to let spotter see target angle IR illuminators Rangefinder to increase accuracy The Spuhr Leupold Mark 4 12-40x60 Tactical Spotting Scope Accessory Ring is a simple, effective upgrade to help you get the most out of Mfg: Spuhr