Hi Edward and welcome. Complete dimensions are: Width = 2.7 inches, Length = 12.5 inches and Height = 2.4 inches. Cheers and stay safe!

Safeguard your scopes from dings, scratches, dirt and moisture. Constructed of high-quality neoprene that wicks moisture away from the scope and helps protect it from rust and corrosion. Will not work on scopes with tall target-style turrets.
Specifications
Brand Hornady
Weight 0.100 kg
Dimensions 12.5 × 2.7 × 0.2 cm
Model
Scope Cover
Height
Black
Size
Neoprene
Style
Slip On
Material
Neoprene
Mount Type
Slip On

Hi Ed, this scope cover is 13" long.
Stay safe & have a great day!