Material and hardware: Made of aluminum alloy and includes all installation hardware (screws and an Allen wrench) for easy mounting. Size: Length 4 3/4 inches (120 mm); Width 5/6 inch (20.8 mm). Rail features: 11slot Picatinny rail mount for optic, scope, or laser sight, with adjustable mounting positions to suit different setups. Alignment and fit: Holes align in a straight line with proper spacing for Marlin lever action. Picatinny rail fits the correct screw hole spacing shown in the picture. Benefits and performance: Durable, lightweight aluminum construction provides solid mounting reliability; precise hole spacing supports stable zero and repeatable accuracy; versatile mounting options with adjustable positions to optimize eye relief and sight alignment. Compatibility: Designed to fit Marlin leveraction rifles with the corresponding screw hole spacing shown; compatible with any optic, scope, or laser sight that mounts to a Picatinny rail. Use scenarios: Mount a red dot or compact scope on a Marlin leveraction rifle for faster target acquisition during field or range use. Attach a laser sight for improved aiming in lowlight conditions or indoor training. Use adjustable mounting positions to finetune optic alignment and eye relief for different shooting setups or shooter preferences.