SMARTCLIP ADAPTER 57MM Manufacturer Model Number: 626640 Manufacturer: Burris Optics Model: BTC Objective Adapter Type: Accessory-Rings/Mounts/Bases Item Type: Accessory Finish: Black Weight: .45 lbs Shipping Weight: 0.45 Feature: BTC Thermal Clip-On Mount Feature: Fits 57mm Objectives Optic Adjustable Objective: false Optic Reticle Illuminated: false