Product details:

Vipers 1-3/4 4X Lens Target Scope is made from high-quality aircraft aluminum. Mil Spec 10-32 rod is extremely durable. Stainless up-pin protects the fiber. Features almost 2 ft. of fiber optic for ideal pin brightness. Has Zeiss coated glass lens with 4X magnification. 1-3/4-dia. housing. Made in USA. Type: Peep Sights.