Professional Heavy Duty Press Studs / Snap Fasteners 15mm Diameter Cap

15mm Diameter Cap Snap Buttons / Press Studs.

Ring Spring type
Genuine Heavy Duty. Made with thick iron
Long - strong stems. The stems are 4mm in diameter and 7mm long.
These are made of Iron and are clothing industry standard
The grip is firm, and they only release when pulled. 
They do not contain a soft zinc alloy (faux brass). 
They do not bend, break or pull apart and will last as long as your garment.
See above video on how to fix the studs together
x 4 pieces = 1 set  
Two pieces that make the cap and two pieces that make the base (see pictures)
For use on leather between 0.5mm and 3.5mm thick