Tube socket mounting hardware, miniature sockets

Set of 10 kep nuts and 10 screws, size 4-40 x 5/16" long.  Enough to mount 5 tube sockets.  Philips head is truss style and does not need any additional washers.   The kep nuts have an attached, free spinning lock washer to keep things tight. Zinc plated steel.  Sold as a set of 20 pieces total.