The ARD reduces lens glare as effectively as a 7" lens shade. Snaps into 40mm objective scopes that are non-threaded without adjustable objectives.Features:- Reduces Lens Glare as Effectively as a Traditional 7" Lens Shade in a Low Profile Design Only 3/8" Deep - Perforated with Scores of Tiny Light-Transmitting Baffles to Reduce Lens Glare with no Observable Loss in Resolution Specifications:- Fits: 40mm Fixed Objective Scopes which are Non-Threaded- Material: High Impact Plastic- Finish: Black