Knurled knob
Black phenolic plastic.
Threaded zinc plated steel stud.
Seven-lobe knob
Aluminium. Polished surface.
Smooth blind hole.
Tapped blind hole.
Tapped through hole.
Four-lobe knob
Wing nut
Black thermoplastic, glass fiber reinforced, mat.
Brass insert with tapped blind hole.
Brass insert with tapped through hole.
Threaded stainless steel stud (AISI 303).