Description Cutting your own porthole just got a lot easier. The Bass Drum O’s Hole Cutter works like a circular glass cutter: you push the center punch through your bass drum resonant head, then wheel the cutter tool around to create the perfect hole. The Hole Cutter is adjustable, too – it makes port holes as small as 2″ all the way up to 10″ in diameter. Port holes make miking and muffling so much easier. And if you’re looking to protect that hole for the life of the head, GN Music recommends using a Bass Drum O’s protector ring (not included; sold separately). Bass Drum O’s Hole Cutter Tool Features: Cuts clean port holes 2″-10″ Tailored for resonant bass drumheads Makes installing Bass Drum O’s much simpler Provides access for microphones and muffling Safe and easy to use