Hexagonal screw for optional use with doorknob spindles. Intended for use with split spindles in doors that have a knob from only one side. By tightening the nut against the door lock’s hub, it helps set the spindle in the lock. Made of steel and zinc plated.
Thread: 3/8 – 20 , outer diameter: 5/8″ , thickness (height): 3/16″