Use the two 10-32 x 1.25" bolts to mount to any stock that has a 48mm bolt span such as some Rem 700 stocks, or you can use the two wood/metal screws to mount it to any wood or plastic stock. You can use one of each style screw if desired or necessary. The Accu-Tac picatinny rail mount is designed specifically for its bipod line. It is cnc machined, and coated with mil-spec hard anodize. Each rail also includes the necessary hardware for installation.Features :Attaches to stocks with 48mm bolt spanCNC machinedhard anodize coating