One Size Fits All Standard Rifle Scopes. (The Bikini fits rifle scopes with objective bells up to 62mm outside diameter.) Millions of shooters appreciate the simplicity, effectiveness and affordable price of this great lens protector. The Bikini was designed for the economy-minded hunter/shooter who prefers a one-piece, quick clearing scope cover. Two pliable rubber-like cups joined by stretch retainers create a tight moisture and dust-proof seal to protect your valuable optics while in storage, transit or in the field.