The Brass is 2mm thick. Available in 6 sizes (strap width).
10Sets Flat Belt Screw Leather Craft Chicago Stud Heads Nail Brass Solid Rivet
100SETS Flat Belt Screw Leather Craft Chicago Nail Brass Solid Rivet Stud Heads
Solid Brass Dunham Full Belt Buckle For 1.5" - 38mm Wide Strap Brass or Nickel