The M7 QA-315B grinds and machines metal, plastic, and wood. You can also use it for sanding those materials. This M7 air tool comes with a 1/8” collet and 1/4” collet for holding grinding stones (sold separately). The 5” extended working shaft lets you access areas that are harder to reach for shorter tools. The pneumatic die grinder also has a 0.3hp motor that achieves free speeds of up to 25,000 RPM.