Warne base maxima extension base only.554" rem 700 matte! FEATURES-Low profile design allows use of iron sights when optics are removed-Full width & depth recoil slots provide maximum bearing surface for recoil key engagement-Bases securely mount to your firearm with Torx-style T-15 socket cap screws, 25 in/lb. of torque isrecommendedFits:-Remington 700, 783, Ruger American Centerfire, Savage Centerfire, Weatherby Vanguard, Howa 1500,Winchester Model 70, Nosler M48 Other Features: Remington 700, 783, howa 1500, win mdl 70, weatherby vanguard, nosler m48, savage centerfire, ruger american centerfire this is an extension base used with the two piece base set for proper eye releif