The STK-4 is an extremely robust straw fork, specifically designed for use on heavy articulated loaders, front loaders, bulldozers, and telehandlers.

The outer tines are spaced 1.50 m (centre-to-centre).

The upper section of the frame consists of two removable box sections. These can either be mounted in the raised position or removed completely, which is particularly useful when stacking bales in buildings with low ceilings.

Another advantage is that the attachment bracket is bolted on. This allows it to be easily replaced with a different mounting system in less than 10 minutes.