Our MDT Bolt Knob can be installed over top of your existing factory bolt knob, or threaded onto 5/16-24, offering superior grip, ergonomics and style of your rifle. MDT Bolt Knobs are currently available for the following rifles: Universal 5/16-24 thread Remington 700 - Right Handed Tikka T3/T1X Savage (not compatible with savage tactical or axis bolt knobs) Ruger American Centerfire All hardware included MDT Bolt Knob Glass filled polypropylene clamshell clamps over existing bolt handle - no bolt modification needed Available for: Rem700 - Right Handed, Tikka T3, Ruger American Centerfire, Savage 110(not compatible with savage ta Mfg: Mdt