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: 11-slot Picatinny rail mount for optic, scope, or laser sight, with adjustable mounting positions. Alignment and fit: Holes align in a straight line with proper spacing for Marlin lever-action rifles. Picatinny rail matches standard screw hole spacing. Benefits and performance: Durable, lightweight aluminum construction provides reliable mounting; precise hole spacing supports stable zero and consistent accuracy; adjustable mounting positions allow optimization of eye relief and sight alignment. Compatibility: Designed to fit Marlin lever-action rifles with matching screw hole spacing; 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 lever-action rifle for faster target acquisition at the range or in the field. Attach a laser sight for improved aiming in low-light conditions or indoor training. Use adjustable mounting positions to fine-tune optic alignment and eye relief for different shooting setups or user preferences.