>>The Dampa mount is a revolutionary scope mount in design and function. Conceived as the ultimate recoil absorbing and accuracy enhancing mount, the Dampa utilizes rubber bushings to dampen the shock and vibration that the telescopic sight would normally be subjected to. This feature almost entirely reduces the need to re-zero your scope between shooting sessions and prolongs the life expectancy of any telescopic sight. >>This version will fit scopes with 30mm tubes with front objective lenses up to 56mm in diameter. The Dampa mount utilizes an extra secure two screw strap and the mount is entirely constructed of high quality aircraft grade aluminum, machined to exacting tolerances at a facility in the U.K. The 4 screw clamping base is suitable for dovetail rails of 9.5 to 11.5mm. Supplied with 3mm allen key that fits both ring and base screws. >>The Dampa mount has long been known as the best scope mount for use on heavy recoiling spring piston rifles .