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POWERTEC'S 4 point knobs are the essential tightening and adjusting solution for your homemade workshop jigs and fixtures, feather boards and precision saw fences, as well as in any application where a 1/4"-20 knob is required. Ergonomic and large, these convenient accessories allow for easy and Quick tool-less adjustment. Featuring a comfortable and secure hand fit that insures the user maximum leverage, control and Agility. The tightly molded-in brass metal insert is hard working, long lasting and won't strip, even with over-tightening. Many woodworkers like to have a few extra on hand because of their usefulness. Constructed of phenolic formaldehyde resins (Pf) for rugged durability. Streamline your workflow and enhance woodworking outcomes with powertec's 4 point knob, 1/4"-20.