Feature A Durable Construction: Made of Aluminum Alloy with Pentagon Cutout Design, 12mm / 0.3" Width, Lightweight yet Strong A Flexible Compatibility: Includes 2 Plastic Adapters to Fit Side Focus Knobs with 32-34mm Diameter A Precision Fit: 100mm / 4.0" Outer Diameter, Secured with One Screw Pin to Lock the Wheel Firmly onto the Knob A Wide Scope Compatibility: Perfect Fit for Minotaur / Marksman / Veyron / Sentinel; Better Fit for Hugo / Everest / ORION A Customizable Options: Accepts OEM & ODM Orders for Tailored Requirements A Easy Installation: Simply test the adapter on the side focus knob, insert it into the side wheel, mount the wheel Video Specifications Outer Diameter: 100mm / 4.0in Inside Diameter: 37mm / 1.45in Width: 12mm / 0.5inch Weight: 55g / 1.9oz Material: Alluminum alloy Adapters Inside Dia.: 32mm and 34mm Accept DIY marking or sticker of 5mm width Easy of use: first try the adapter for the side focus knob, fill the adapter into the side wheel, assemble the side wheel on the side focus knob, at last faster the screw pin. Compatible Rifle Scopes