Product Description 3M(TM) die grinder, powerful and light-weight tool. Off-set gear box for increased torque. Gripping material for greater operator comfort. Safety lever throttle to avoid accidental starting. Ideal for heavy-duty applications. 1/4-inches air inlet thread, 1/4-inches collet size. It has 12000 maximum RPM. From the Manufacturer ?The 3M Die Grinder features an adjustable directional exhaust that allows airflow to be directed in any direction preferred, even toward the operator for cooling if desired. To prevent accidental starting, the die grinder incorporates a safety lever. A die grinder is a handheld power tool that runs spindle-mounted abrasives such as coated abrasives or nonwoven surface conditioning abrasives. Typical coated abrasive products that you can run on a die grinder include cartridge rolls for reaching tight corners and crevices, cross pads for sanding small internal diameters, and evenrun bands and flap wheels for sanding and polishing contours. Scotch-Brite surface conditioning products typically used include radial bristle discs, combination wheels, and cross buffs for removing rust and debris from internal diameters of small cylinders. These are just a few of a multitude of products that can be run on a die grinder.