This is a model of an insert holder with insert, screw and a torx key. Back then when i designed it (like 5 years ago) i took some liberty and didnt hold 100% to the norm but it is something like a “DIN 4968 VDUH 48 14 45 F”. Why I did this i dont really remember, probably i had some difficulty with the angles and just went with what worked. Since its only a model and no one will use this to craft a real tool I think its fine :)

Like my 40mm CNC end mill this also was a gift for a fellow CNC-machinist student for completing his apprenticeship, but one that was taught cnc turning and not milling.