Browning's x-lock steel base locks your scope base down securely.It uses four screws per base, replacing the traditional two-screw system.This model is compatible with x-bolt rifles and browning standard type rings and has a black gloss finish.Type: 2-Piece BaseModel: X-BoltStyle: X-LockMisc: Compatible w/Standard Browning RingsFinish: GlossMaterial: SteelPieces: 2Gun Type: RifleMount Type: ScrewsRings Included: No