This is a fully enclosed bolt-on two piece tactical sure grip knob made of black powder coated alloy. It bolts to your plain sad looking factory knob. This is an easy do it yourself project, and if in the future you want to go back to your regular bolt knob, just unscrew and you're done. Select which one you want; 1) Howa 1500 SA. 2) Howa Mini 3) Ruger America Ranch (will only fit the 18mm wide and flat end bolt). 4) Savage 10, 11, 12, 110, 111, 112 (small OEM bolt only) 5) Savage Axis 6) Savage MK2 7) Tikka T1X