knurled knob / lobe / stainless steel
Star grips stainless steel, similar to DIN 6336
Stainless steel 1.4308.
Grub screw stainless steel 1.4305.
Pin stainless steel 1.4310.
Ground and polished or blasted.
Grub screw and pin bright.
Form B: drilled through
Form C: blind hole
Form D: tapped and counterbored
Form E: tapped blind hole
Form L: external thread