ScopeCoat Large Cover for 42mm Rifle Scopes Black 12 1/2in. x 42 mm. Their scopes require the best protection to maintain optimum performance. Scopecoat provides that protection with the Large Rifle Scope Protective Covers. To figure out what size ScopeCoat you will need for cylindrical type Rifle Scopes measure the following Measure the overall length of the scope. Include sunshade if applicable. Measure the objective size. (The objective end of the scope is the end you do NOT look through while in use). Measure the turrets. These are the adjustment knobs on the scope. Note - Scopecoat cylindrical covers stretch 1 to 1 1/2 inches pass the actual size. For example a 10.5 inch cover can stretch to 12 inches. With this in mind select the right size for a relaxed or snug fit. Specifications for ScopeCoat Large Cover for 42mm Rifle Scopes: Manufacturer: Scopecoat Attachment Type: Slip On Features of Scope Coat Protective Covers: Variety of colors Easy application Package Contents: ScopeCoat Large Cover for 42mm Rifle Scopes Give your high-end optic the protection it deserves with the original Scopecoat by SENTRY the industry leader in protection of weapons and gear. Safeguard your optics from dust dirt dings scratches and moisture. Made from Neoprene a material commonly used in wet suits conforms to the shape upon which it is placed so it takes up minimal space in your safe or case. Our Neoprene/Nylon laminate composition assists in repelling moisture and condensation away from your optic as well as dirt and debris. This combination helps to protect your optics from the elements and damage while storing or transporting your gear.