Unique and cover-up design for mechanical locking head.

独特隐蔽机械锁头设计。

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Locking head screws have some peculiar differences from conventional screws.

锁定头的螺钉与传统螺钉有特别不同之处。

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The first difference is that a torque-limiting screwdriver is useful during placement of the locking head screw.

第一个区别是在拧入锁定头螺钉时的扭矩限制扳手非常实用。

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The head teacher and five staff members remain suspended over alleged ill-treatment including locking a pupil in a room.

BBC: Revoe Community Primary School