Gas Mask

The pole top pin is made from hot new rolled steel. The steel will heat to red and punched to the designed shape. The finish of the pole top pin is hot dip galvanized which is reasonably smooth and free of burrs or other sharp projections.

According to the different shapes, there is another type called Y clevis. It’s because the structure is like letter “Y”. On the one hand of the ball clevis is a ball head. On the other hand, there is a steel pin or hex bolt going through the two holes of the ball clevis. So that, there is space for the U clevis to connect the ball clevis.