These are bi-material small wing screws made up of a black nylon head with a diameter of 32 mm for the BPF 61 model and a 25 mm diameter for the BPF 62 model and a zinc-plated steel insert.
Its head with small ears allows a good grip for manual tightening and loosening.
This fully threaded part is bi-material, namely composed of a black nylon head with small ears and a zinc-plated steel screw. This dual material property gives it better strength.
Their use can be in all sectors of industry. However, you need room in your assembly for the head with small ears but also the regular use of tightening and loosening.