Grizzly H6193 is a 1⁄4" industrial die grinder with a no-load speed of 22,000 RPM and a collet size of 1⁄4". It requires a maximum of 90 PSI with a minimum of 4 CFM compressor capacity. The air inlet is 1⁄4" and the air exhaust is in the front. The die grinder weighs 1.2 lbs and comes with two wrenches for securing tools. It is important to lubricate the die grinder with 3-4 drops of oil directly into the air fitting before each use. The die grinder is capable of grinding, sanding, and polishing a variety of materials, including metal, wood, and plastic.