... standard SY/T5527.There are two designed kinds of bumper in hook cylinder, mechanical and hydraulic, with excellent bumping function.The main ... 7/8200 7 7/82007 7/8Opening size of main hook mm(in)2208 21/322208 21/322208 21/32Overall dimension mm ... 21/32Weight kg(1bs) 21804806 3420754034967707 Drilling rig Hook ,DG225,DG315,DG450,hook for drilling,drilling rig,oil drilling machine,drilling rig square ...