Knurled Thumb Screws with Slotted Head for screwdriver tightening.  Overall length 0.850 inch. Head is .328 inch in height and 0.195 inch in diameter. Shaft is about 0.50 long with the bottom 0.25 inch threaded to 4-40 machine screw thread typical of D-Sub connectors. 3 bags of 2,000 pieces for a total of 6,000