Fuji Percussive Tools Features:VALVE MECHANISMS: Fuji Percussion Tools are equipped with the following valve mechanisms:A. PLATE VALVEPlate valve consists of four parts of valve sheet, valve cover, valve case and valve. This simple mechanism and plate valve surface provide longer durability. FR SeriesB. SLEEVE VALVEHollow valve enables a light and compact body and longer stroke for its size.C. PISTON VALVEHigh blow frequency (60Hz to 90Hz) can be maintained as this piston functions as a valve providing high working efficiency.LOW AIR CONSUMPTION: Low air consumption 0.14-0.18 m3/min (due to the valve mechanism) enables Fuji Percussion Tools to be used with a smaller compressor.QUICK CHANGE ATTACHMENTS FOR PERCUSSIVE TOOLS: Attachment, such as chisels and needles, can be quickly and easily changed.LOCKING HANDLE: The locking handle are designed to reduce the risk of accidental starting of the tools. The handle is automatically locked when the operator releases the handle.LOW BLOW FREQUENCY: The built-in Sleeve Valve allows the operator to adjust the blow frequency by adjusting the throttle valve.