This one-piece aluminum base is machined to tight tolerances for a custom fit.It offers maximum strength for rings to hold tight.Screws are included.Fits chappa double badger; cva round barrel/receiver (post '96 model); remington genisis; traditions in-line muzzleloaders w/round receivers; winchester x-150, apex muzzleloaders.Type: 1-Piece BaseModel: Top MountStyle: Top MountFinish: Black MatteMaterial: AluminumPieces: 1Rings Included: No