The BAR20020 adopts a universal design, which is perfectly compatible with most Barnett crossbow models, including many old models. It can be seamlessly installed on the stock of the crossbow without complicated modification or additional tools, and even beginners can complete the installation in a few minutes with the help of the attached instruction manual. The package is equipped with a full set of installation accessories, including the crank cocking device main body (with left and right reels), special bowstring and hook components, all installation screws, gaskets, pins and detailed installation and operation instructions, so you don’t need to purchase additional accessories, and you can use it directly after unpacking.