The Weaver Top Mount Base Pairs provides a 2 rail slots for mounting an optic to your rifle. With this 2-piece scope base, installation is simple and only requires a screwdriver for the included mounting hardware; no specialty wrenches or alignment tools are necessary for proper installation. The no frills Mount Base Pairs is a simple mounting is compatible with all Weaver Top Mount scope rings which are sold separately and readily available. Constructed from lightweight tough aluminum, this mount can withstand the most powerful recoil.Specifications and Features: Manufacturer #: 48482 For Winchester XPR Rifles 2-Piece Weaver Rail Scope Base Compatible with Weaver style rings Aluminum Black