Don't need so many safety hammers, just a few on the bus, so many easy to fight

The design is good. In actual operation, it is extremely easy to break down. Equipment and buckle design lack firmness and are easy to break down. The idea is worth promoting, just don't mass produce

People who are taller are prone to pain

Then the pull ring was also lost

Easy to be taken

Pure Harper Design

The cost is quite high.

The angle of the broken window hammer cone is calculated and tested repeatedly. It is still difficult for curved metal to break tempered glass.

Compared with the conical tip of the traditional safety hammer, it is a problem whether the curved curved surface can reliably break the glass. I don't know if there are any relevant mechanical calculations. In addition, since the safety hammer hung on the wall can be taken away by some people, how can this design ensure that it will not be taken away?

Will take it away