Lenses with the dimensions 60x60 mm fit into the sturdy window frame

The lenses are securely clamped in the frame by two steel springs and are easy to change

Teh wire cloth is surrounded by an aluminium frame

The inside of the goggles is blackened so that the wearer is not blinded by glare from the inside

Teh Bochum goggles can be attached to the hard hat by means of a hinge