These are genuine NEW OLD stock with the central grub screw.
These fit all Original Edge & Lo Pro Japanese trem systems and also the newer Edge Pro system that all have an M8 Metric thread.
These posts will NOT fit any KOREAN/INDONESIAN/CHINESE or TRS / LO TRS systems.
The perfect replacement for your tired original trem - Over time these posts can wear which causes tuning stability problems.
Please see my other listing for replacement trem post anchors too for the ultimate refresh of your system.