nail penetration test of metal penetration resistant inserts

What does it test:

It tests the quality of metal penetration resistant inserts to the nail penetration.

Why is it important:

Workers are sometimes exposed to different sharp pieces on the floor, which could penetrate the sole and hurt the foot and destruct the shoes. Therefore the sole of specific footwear includes penetration protection inserts, which should be of sufficient quality to protect the foot from hurting, when step is made on a sharp pieces.