The Plugin makes it super easy to insert your own butt plug. If you want to functionally increase each arms length by about 8 inches, then the Plugin is for you because it gives you a straighter shot without twisting your body. The Plugin fits almost any butt plug that you already own, as long as it has the normal safety feature of a slimmer neck and bigger diameter flat base. It fits all the plugs in this picture. There is a lot to learn and enjoy the about intricacies of the awesome sphincter muscle. The quickest way to learn and the easiest way to enjoy is with two handed precision insertion.