Weaver Rem SA 20 MOA 99485 multi-slot base 1-Piece/extended. Hunting scopes mounts. Made of the highest quality materials Hunting scopes mounts Fits Winchester Model 70 Short Action made between 1984 and 2008 Made of 6061-T6 aluminum Matte type III hard coat anodize finish Compatible with Picatinny or Weaver style rings Provides additional 1 of forward length for more mounting options No slip, non-strip Torx screws