... designed kinds of bumper in hook cylinder, mechanical and hydraulic, with excellent bumping function.The main hook has ... alloy steel with high strength, and tested by UDE method Model DG225 DG315DG450Max. hook load kN (lbs) 2250 (500000 ... 21/32Weight kg(1bs) 21804806 3420754034967707 Drilling rig Hook ,DG225,DG315,DG450,hook for drilling,drilling rig,oil drilling machine,drilling rig square parts,