Push-pull knob
Black phenolic plastic.
Tapped blind hole.
Handgrip
Six-lobe knob
Brass insert with tapped blind hole. Filled knob.
Brass insert with tapped blind hole.
Brass insert with tapped through hole. Filled knob.
Brass insert with tapped through hole.
Threaded zinc plated steel stud. Filled knob.
Threaded zinc plated steel stud.
Stainless steel insert with tapped blind hole (AISI 303).
Stainless steel insert with tapped through hole (AISI 303).
Threaded stainless steel stud (AISI 303).
Knurled knob