Requires a lot of air. I'm a wood turner and was hoping to use this as a finish sander. As others have written I didn't expect to need a lot of stuff and limited it to 220g and up. But I've found that my drill bit works better with a 2" backing pad. I have a 25 gallon 6 hp/110 psi supercharger. but it was ineffective compared to my drill, i returned it.