If you want to add a port hole or two to your kick drumhead, Bass Drum O's are the way to go. Of course they look cool - if you play rock or metal, Bass Drum O's are guaranteed to boost your drumming cred. But they also protect your port from damage and cover up frayed, uneven, and unsightly cutouts. Cutting your own port hole 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.