Viper Archery Products Bow Sight Microtune 5 Pin .019pin. This feature provides added precision for shooters that like to experiment with different pin widths. The MicroTune feature in the Viper Optic Centerless Sight (OBS) allows the archer to remove and replace the central focus rod (within reason). Due to its lack of glare this sight can be used in the lowest of light situations and is very easy to install. The MicroTune feature gives the archer the ability to customize their pin widths without the fear of changing pins. Furthermore because the MicroTune is a Viper sight the vertical and horizontal adjustment control keys can be set to only work with one particular pin diameter rather than having a large variety of pins. This feature provides the ability to further customize pins per shooters preference. Specifications for Viper Archery Products Bow Sight Microtune 5 Pin .019pin: Manufacturer: Viper Archery Products Additional Features: 5-Pin Diameter: 0.019 in Package Contents: Viper Archery Products Bow Sight Microtune 5 Pin .019pin