... /T5527.There are two designed kinds of bumper in hook cylinder, mechanical and hydraulic, with excellent bumping function ... strength, and tested by UDE method Model DG225 DG315DG450Max. hook load kN (lbs) 2250 (500000 31507000004500 (1000000Spring stroke ... (1bs) 21804806 3420754034967707 Drilling rig Hook ,DG225,DG315,DG450,hook for drilling,drilling rig,oil drilling machine,drilling rig square parts,