Shrewd Optum 40/35mm Ring System Diameter:.019 Makes changing springs to modify

Makes changing springs to modify the trigger tension a breeze

Full side zips allow you to easily step in the bib with boots on

The Summit extends exceptional value and ease of use to all archers

Width Cocked / Uncocked: 21

Shrewd Optum 40/35mm Ring System Diameter:.019 Makes changing springs to modifyOptum Ring system (O. R. S.) for the 35mm and 40mm Optum scope This must be used in conjunction with an Optum scope Makes it possible for shooters to change pin positions, fiber color, or fiber size by swapping between multiple rings in seconds Features exterior fiber wrap that captures ambient light for a brighter pin Adjustable fiber cover allows precise control over fiber brightness Two 8 32 holes for installing a light in seconds Eight pin