The delta series ar-15 mag well vise block is designed for use with the tipton best gun vise this center support slides into the magazine well and provides a steady base for cleaning or light gunsmithing on your ar-15 in either breech or closed position.Users without a best gun vise can mount the mag well vise block directly to their bench top with the included fasteners.Type: Vise BlockSize: SteelQuantity: 8" x 13" x 2.5"Includes: AR-Style RiflesMaterial: PolymerTip Feature: UniversalProtects: 1