Traveling Block for drilling rig machine
(YG135, 170, 225, 315, 450)
Series travelling blocks conform to API Spec 8A, and are granted the right to use API monogram.
Conforms to industry standard SY/T5527.
1 Special structure in main body with good hydraulic buffer function.
2 The main hook is equipped with double... - Update: 2011-12-15