Talley Two-Piece Stiller Tactical Predator Picatinny Rail 8-40 Screws Black. This simplified mounting system eliminates the possibility of an out of alignment interface or loose connection between the ring and base of traditional two-piece designs.Ultimately this provides more strength and durability than rival steel rings and bases but with a lighter overall weight. Fully CNC machined from lightweight aircraft-grade aluminum to the industries tightest tolerances this rigid scope mounting platform requires no lapping and is ready to go out of the box. Specifications for Talley Two-Piece Stiller Tactical Predator Picatinny Rail: Manufacturer: Talley Color: Black Fabric/Material: Aluminum Alloy Features of Talley Two-Piece Stiller Tactical Predator Picatinny Rail Fully CNC Machined Integrated Scope Ring and Base Design Lapping Not Required Package Contents: Talley Two-Piece Stiller Tactical Predator Picatinny Rail Mounting Hardware T-15 Torx Wrench Talley 25S719P: Two-Piece Stiller Tactical Predator Picatinny Rail 8-40 Screws Black