Monstrum Rubberized Flip-Up Rifle Scope Lens Covers Objective Lens Size F Black 43-49 mm. Protect your optics from dust and abrasion with the Monstrum Tactical Rubberized Flip-Up Rifle Scope Lens Covers The spring-loaded Flip-Up mechanism pops open effortlessly when needed and securely tightly in place when not in use. Crafted from durable rubber and polymer materials they conform tightly around your rifle scope tube protecting the finish while shielding it from the harsh elements. Each package includes one Rubberized Flip-Up Lens Cover. For optimum fit carefully measure the outside diameter of both your rifle scopes eyepiece and objective lens. Available in a full range of sizes to fit any rifle scope. Eyepiece Cover available in: 37-42 mm(1.5-1.7 inch) diameter 43-48 mm(1.7-1.9 inch) diameter Objective Lens Cover available in: 26-30 mm(1.0-1.2 inch) diameter 31-36 mm(1.2-1.4 inch) diameter 37-42 mm(1.5-1.7 inch) diameter 43-48 mm(1.7-1.9 inch) diameter 49-54 mm(1.9-2.1 inch) diameter 55-62 mm(2.2-2.4 inch) diameter Flexible rubber tubing cover design secures snugly around specified range of tube diameters. Specifications for Monstrum Flip-Up Rifle Scope Lens Covers Objective Lens: Manufacturer: Monstrum Fabric/Material: Rubber/Polymer Condition: New Features of Monstrum Flip-Up Rifle Scope Lens Covers Objective Lens Available in a full range of sizes to fit any rifle scope. Eyepiece Cover available in: 37-42 mm(1.5-1.7 inch) diameter 43-48 mm(1.7-1.9 inch) diameter Objective Lens Cover available in: 26-30 mm(1.0-1.2 inch) diameter 31-36 mm(1.2-1.4 inch) diameter 37-42 mm(1.5-1.7 inch) diameter 43-48 mm(1.7-1.9 inch) diameter 49-54 mm(1.9-2.1 inch) diameter 55-62 mm(2.2-2.4 inch) diameter Flexible rubber tubing cover design secures snugly around specified range of tube diameters. Package Contents: Monstrum Flip-Up Rifle Scope Lens Covers Objective Lens Each package includes one Rubberized Flip-Up Lens Cover. For optimum fit carefully measure the outside diameter of both your rifle scopes eyepiece and objective lens. Monstrum FCO-F: Rubberized Flip-Up Rifle Scope Lens Covers Objective Lens Size F Black 43-49 mm