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. 1.6″ long This will greatly enhance the ergonomics and bolt cycling characteristics of any bolt action rifle with M6 x 1mm thread; CZ 457 Accuracy International AE, AW, and AX Bergara B-14 Blaser R8, R93 Browning Maral Chapuis Rols Desert Tech SRS (all variants) Lithgow LA101, LA102 Mauser M12, M18 Merkel Helix Sauer 100, 101, 200 STR Sig Sauer SSG 3000 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/