Part wood screw, part machine screw. Also known as Table Leg Bolts as they are often used in furniture manufacturing. Screw one end into wood, and the exposed end provides a machine threaded stud. Stocked in diameters from #6-32 to 1/2" and lengths up to 6" in steel with zinc finish. Hanger bolts with plain center (unthreaded center) to make installation easier also available. Full thread and plain center hanger bolts also available in stainless steel 18-8.