14,000 strokes per minute; .007" stroke length (.018 mm); precision removal resulting in less risk of gouging delicate parts; less aggressive than a Die Grinder; Lightweight & Faster than hand-filing. Only one included wrench required; easier to change files; Easy grip rubber sleeve; Includes 3 mm collet insert. Accepts 1/16", 3/32", 1/8" collet inserts (sold separately). Lubrication is not recommended during operation. Lubrication is ONLY recommended during storage. Easy grip rubber sleeve makes it easy to hold tool securely. Especially important when using tool for precision removal on delicate parts. In-line 360-Degrees Swivel is incorporated into the airline. This allows more maneuverability for the operator on contoured parts. In-line filter is included to prevent debris from entering the tool through the airline. Scribes and Chisels are made of high carbon steel that is heat-treated and tempered to a hardness of 62 Rockwell.