The specification of guide board is 405mm. It is portable and applicable. Product Name:Electric Chain Saw Product Model:R7451 Product Model..............M1L-RY-405 Skid Length................405mm Saw Blade Speed............400m/min Rated Input Power..........1300W Rated Voltage..............110-240V Rated Frequency............50/60Hz PCS/CTN....................2 Measurement................55.5*52.5*24cm G.W./N.W...................7.4/6.8kg