STYLE PENCIL TYPE: This micro pneumatic air Pencil die grinder is lightweight for getting into tight areas and easy to use with both hands SPEED CONTROL: The miniature pneumatic die grinder features variable speed throttle control. The pencil pneumatic grinding tool shaft allows for perfect control when cutting and polishing surfaces HOSE PROTECTOR: Convenient hose with hose protector PACKAGE CONTENTS AND STORAGE: 1 x pneumatic air Pencil die grinder, 1 x box of extra diamond needles files. Specification：Chuck size: 3mm 3.17mm & 2.38mm, 65000RPM, Air Inlet: 1/4”, Hose Size: 3/8”, Air Pressure: 90 PSI One collet comes with the tool, two additional collets are included.