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. 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. They will greatly enhance the ergonomics and bolt cycling characteristics of any bolt action rifle, like Remington 700s, Ruger American, Savage 110 etc. 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/