Knurled knob
Black thermoplastic, glass fiber reinforced, mat.
Brass insert with tapped blind hole.
Brass insert, smooth blind hole and tapped grub screw.
Brass insert with tapped through hole.
Threaded zinc plated steel stud.
Threaded stainless steel stud (AISI 304).
Black phenolic plastic.
Seven-lobe knob
Aluminium. Polished surface.
Smooth blind hole.
Tapped blind hole.
Tapped through hole.