Tactical sure grip bolt knob in black anodized black aluminum with diamond patterned knurling. In addition to the black anodizing, these knobs have been finished with an industrial mil-spec coating (oil and solvent resistant) to give them a superior finish and appearance. They will greatly enhance the ergonomics and bolt cycling characteristics of any bolt action rifle, like Remington 700s, Ruger American, Savage 110 etc. The short knob is 1.75" long and the long knob is 2" long. These knobs will fit all bolt handles threaded in 5/16X24. Select which one you want; 1) 1.75" long 2) 2" long if not already threaded, a Gunsmith is recommended to fit this. fitting guide https://www.okshooters.com/threads/diy-badger-oversized-bolt-knob-install-remington-700.223771/