Includes: Riser Mount, Allen wrench Materials: 6061 Aircraft Grade Aluminum Compatibility: Picatinny Rails Length: 25 Slot: Base: 3.5 in; Rail: 10 in Height: Low profile mount provides 0.43 inches of rise. Width: 1.25 in Color: Black Warranty: Lifetime The Monstrum Shrapnel Extended Riser mount offers the same rock solid performance as the rest of our riser mount line, but with extra forward extension for more flexible optic placement and eye relief positioning. The picatinny base measures 3.5 inches in length while the top rail measures 10 inches (25 total picatinny slots). The rail extends over the front of the base, allowing for more forward positioning of long eye relief optics.