This kit is an upgrade to the self-adjusting chuck and/or slip clutch with 3-hole sizes for the diaphragms, foam ring support insert, standard rod butt cap and zip ties. The diaphragms will hold rod butt sizes ranging from 5/16″ to 1 ¾” in diameter. The foam ring support insert is designed to go inside the self-adjusting chuck prior to installing the diaphragm and will help the rod self-center and support the diaphragm for a longer life. The standard rod butt cap works with our 13/16″ standard diaphragm extremely well, so consider using this butt cap on your rod during construction as a placeholder for your chosen butt cap. The zip ties are the right size to make it all fit tight.