For drilling fish bolt holes from 9.8mm to 36mm diameter in linear railway line with mini 4-Stroke gasoline engine. 17kg light weight can be easily carried. Both HSS and Alloy drill bits can used for rail drilling machine with 25mm effective drilling depth. Unconventional models can also be customized. Engine 4-stroke 1.0KW Application 43kgm 75kg m rail Rated RPM 275 25rmin Drill diameter 9.8 36 0.5 Drill accuracy Tolerance 1mm Drill time 30s Drill bit operation life 40 50 times Tank capacity 0.8L Dimension 650 360 340mm Weight 17kg