There's no longer a need to search for front and rear bases for your most popular firearms. Weaver Base Pairs feature tough, lightweight aluminum construction to hold up to the most powerful recoil. The Weaver cross lock design means a tight, secure fit on your firearm. These bases accept all Weaver top mount cross lock rings.Specifications and Features:Type: 2-Piece BaseModel: Top Mount Base PairsStyle: WeaverMisc: Accepts All Weaver Top Mount Cross Lock RingsFinish: Black MatteMaterial: AluminumPieces: 2Gun Type: RifleMount Type: To ReceiverRings Included: No