Operating the bolt in your Ruger Precision Rifle has never felt better thanks to the TandemKross Challenger Bolt Knob. Featuring an enlarged profile, multi-faceted design, and removable o-rings for customizability, the Challenger is made to fit common 5/16"x24 thread pitch bolt handles. While the bolt knob can easily be hand tightened, it also features a socket for a 5/16" allen key to mount it to the bolt handle securely. An included polymer cosmetic cap may also be optionally used to keep out moisture or debris. The Challenger Bolt Knob's common thread pitch allows it to fit on more than just Ruger Precision Rifles. This upgrade is also compatible with centerfire models of the RPR, all models of the Ruger American Gen II, and virtually all popular models from Remington, Howa, Springfield, Tikka, Savage, Faxon, Aero Precision, and more. FeaturesTextured and extended for easy useCustomizable with removable O-ringsDurable and lightweight upgrade Compatible Models:Ruger Precision Rim...