This 3" Sunshade is compatible with Varmint Riflescopes with 40mm Objective Lenses. Designed to reduce glare and increase overall clarity and image contrast. Note: Riflescope NOT included; Compatible Models Include: AC11084 10-40x50, Mil-Dot; AC11318 10-40x50, Target Dot; AC11320 8-32x50, Range Finding; AC10828 8-32x50, Mil-Dot; AC10050 6-24x50, Mil-Dot; AC10048 6.5-20x50, Target Dot; AC10042 4-16x50, 30/30.