This Bausch & Lomb Mount is for the Remington 740, 742 and 760 rifle. This is for mounting the externally adjusted Bausch & Lomb Balvar, Balfor and Baltur scopes. This fits the standard length Clamp Rings (61-42-81), also available on this site. New old stock from a long gone gunstore, these are getting harder to find. Free shipping.