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. This will greatly enhance the ergonomics and bolt cycling characteristics of any bolt action rifle. Mx1.25mm thread 1.6″ long This will fit but not limited to; HTI SRS TAC41 Youtube clip is a similar bolt to show how easy it is to replace. 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/