The best and only way to attached a bass drum to your hoop without leaving even the smallest mark. I bought a prolite second hand and the owner had used one of these sonor pedals with it for eight years or so, when I received the kit I could tell where the pedal had been mounted. Unfortunately it only works with sonor pedals but fortunately they are pretty much the best anyway (for me!) so....excellent adjustability and quality, even came with a key!!