Our range of locking hole and non-locking PCB supports are suitable for a top hole diameter of 4.0mm, they are available in both threaded and unthreaded versions. The unthreaded version is available in Natural Nylon 66 and is suitable for use with a #6-32 self tapping screw. The threaded ones are suitable for M3 and M4 screws they are available in Natural and Black Nylon 66.