It is a black nylon and zinc-plated steel bi-material screw. It is fully threaded and has a serrated knurled head with a diameter of 20 mm.
Its base is an asset because it allows for a larger bearing surface.
You can find its fully plastic equivalent in our range, it is the PLAS 100.
Its knurled head gives it a better grip. They can be used in all types of fields requiring frequent handling.