This is a simple type knock pin that does not require a precise hole.
Fixed from the inside by the force of a spring that operates toward the outside. (The applicable holes are the same as the nominal diameter.)
The corrugated grooves make it less likely to get tangled with each other compared to straight shapes.
A small pack series that is convenient for when you need a little bit of something.
Prevents bolts, shafts, etc. from rotating, falling off or falling off.