Check the listing for details. Threaded Knobs 5/16”-18 Female - Steel Threads Clamping Fixture Jig Knobs 4 pack. Color: Black, Condition: New. Listed at 11.88 USD. Molded plastic 5 lug star knob with steel threaded insert 5/16-18 female thread A knob is a knob, right?? Not really. What makes our knobs most notably different than many others you will find is our threaded STEEL insert. Durable molded plastic knob features a steel threaded insert, much stronger and more resistant to stripping than brass or plastic threaded knobs. Other features include a thru hole for mounting over bolts, studs or threaded shafting of any length. No need to resort to using spacers or washers to compensate for a stud that extends too far beyond the work-piece and bottoms out in the knob before clamping pressure is achieved. Plastic also has molded in stippling to help improve grip while turning or handling. All of our knobs threads are chased with a sizing tap to ensure threads are free of any molding flash or other defects that would effect smooth operation. These knobs can be used in so many ways. Here are just a few: Machinery ToolingClamping FixturesJigsTemplates AppliancesExercise EquipmentOutdoor FurnitureCrafts & HobbiesAudio & Video EquipmentAnd so much more! Dimensions are approximate. 1.75" diameter knob, 0.95" overall height, 0.88" shaft diameter x 0.44" shaft length. Steel threaded section provides approximately .25" of thread length, about the same as a standard nut.