Each knob consists of a plastic star-shaped knob with attached brass insert. The thru knobs screws have no edges or burrs.
The star knobs work great as a holding jig, holds steady and requires little effort to loosen and tighten back up.
Designed for easy tightening of the knob and can be easily used with protective gloves. The screws are free of corners and burrs, the screws are firmly fixed and can be tightened very stably.
Ideal for homemade jigs, fixtures, machine tools. Widely used in mechanical equipment, instrumentation, food and industrial equipment.