COMPATIBILITY: Aluminum mortise cylinder collars designed for standard mortise lock installations, pack of 10 pieces MATERIAL QUALITY: Durable metal construction with a Aluminum finish that resists wear and corrosion DIMENSIONS: Precision-engineered rings sized to fit standard commercial mortise cylinders for secure installation INSTALLATION: Simple to install between the cylinder head and door surface for a professional-looking finish VERSATILE USE: Ideal for both new installations and retrofitting existing mortise lock systems in commercial or residential settings, Manufacturer: Pacific Doorware