Three-lobe knob
Black phenolic plastic.
Threaded zinc plated steel stud.
Zinc plated steel outcropping insert.
Black thermoplastic, glass fiber reinforced, mat.
Brass insert with tapped blind hole.
Brass insert with tapped through hole.
Lobe knob
Square through hole.
Four-lobe knob
Zinc plated steel insert with tapped blind hole.
Embossed knob
Black thermoplastic.
Knurled knob