Ruger American Ranch 450 Bushmaster Matte Black Steel. The brake clocks into position using an easy-to-use external jam nut. It reduces noise and blast to the sides of the shooter. Installs quickly using an 7/8" box wrench or crescent wrench. The brake is manufactured from alloy steel with a matte black finish. Specifications for Ruger 90641 American Ranch 450 Bushmaster Matte Black Steel: Manufacturer: Ruger Finish: Matte Black Fabric/Material: Steel Hand: Right