This is a fully enclosed bolt-on two piece tactical sure grip knob made of black powder coated alloy, for Remington 700 or 783 models. It bolts to your plain sad looking factory knob. This is aneasy 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) Remington 700 #2) Remington 783 Locktite is recommended on the screws and I have that listed separately. Youtibe video is the same design, but different brand.