The part is made from billet alum. and has a handy finger flats to grab as well as a flat blade screw driver slot machined into it to make turning it an easier task. Simple to install the racer will have to drill five holes into the injector butterfly or the side of the injector housing and then install the 10-32 bolt grab a 3/8" wrench to install the Nylock nut and you are done.
The holes in the air bleed wide open is .320", that is adjustable in thousandths and can be closed all the way down if desired. With this installed on the injector consistency will become your friend and round wins will become more common.
Butterfly air disc includes detailed instructions and a hole drill template that makes installation an easy project.