Ever get tired of locating and using a hex key wrench to tighten and loosen the quill lock on the 5500 HiTorque Bench Mill? Here is the answer to that quandary – the Quill Lock Knob. There are two versions of this knob: a 1.5″ plastic Rosette style knob, and a 2” knurled steel knob. The knob is threaded to match the existing socket cap screw that comes with this mill that is used to lock the quill. Just thread the knob into place, loosen and tighten when necessary, and leave it in place for future use.