井口上的双头锁定螺栓 lock down studs on wellheads
前锁芯上沿轴线对称设有带V形凹槽的双排弹子；
The front lock cylinder is provided with double-row pin tumblers with V-shaped grooves symmetrically along the axis.
一款现在国际上最为安全，可靠的挂锁。它具有双排的弹子设计。大为提高了不误开率，经测验可以达到90万把锁以上的不误开比例。并且做工精细。
This is a safe security lock. It is the safest and most reliable padlock. It's special design of double line night-lock exactly reduces the ratio of being opened by accident or similar keys.
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