... in highway constuction,railway construction,bridge constr EPT I Series Rotary Drill Rig cylinder is a type of single piston and double ... Size, Light weight, High intensity. High intensity,fatigue design,adapative cylinder designed as per loading frequency analysis are applied,and piston ... weight,high intensity and high reliability.2. Many optional sizes,bore size can be from 40mm to 450mm;3. Fixing type ...