Barska 5-Inch 50mm Varmint Riflescope Shade Compatible with Varmint Riflescopes- Models: AC11084, AC11318, AC11320, AC10828, AC10050, AC10048, AC10042. Will only fit Barska brand rifle scopes Reduces sun exposure Reduces glare Increases clarity Increases image contrast Outside ring on adjustable objective is removed then the sunshade is put in place.No tools needed