Use upper and lower two sets of saw blade cutting can be installed at the same time small thin blade, greatly reduced the loss of timber, also save the spending to buy saw blade.Pillar, roller pin, tube, chain saw shaft are installed for oil pump in areas such as the oil supply, leave out the trouble that oil gun oil supply;And roller pin shaft parts installed the oil-retaining bearing, greatly reduce the oil supply frequency (saves fuel supply time and lubricating oil).Saw shaft through dovetail guideway of the saw blade can be adjusted up and down is easy to install different diameter.