oep supplies standard and custom plastic knobs manufactured with state-of-the-art molding and metal working equipment. knobs available in most materials - polypropylene, abs, nylon, phenolic, etc. oep also supplies a wide range of threaded metal inserts to fit most application needs. finally, oep offers the original knob-lok self locking vibration resistant knob. knob-lok utilizes aerospace technology to provide a 360 locking ring dampens vibration and provides consistent torque.**