All Binder screws (Chicago Screw, Post screws) Fasteners are complete with hull and screw.

Book Binder Screws, Binder Screws, Chicago Screws,

Length 5mm, Head Ø 9mm, Shaft Ø 4mm, screw M3x4mm,raised head Ø 8mm
[Shaft material brass/screw material iron]