Nickel free. Both caps are 1/2 in diameter. For the best finished look, be sure to use Wide Double Cap Rivet Setter with Anvil to properly set rivets. Specifications Cap.
Double Cap Rivets - 100 Pack — Tandy Leather International
Leather hardware - Standing Bears Leathercraft Hardware
Double Cap Rivets Nickel Plate - 1,000 Pack — Tandy Leather, Inc.
Solid Brass/Nickel Double Cap Rivets
Tandy 2018, PDF, Leather
Tandy 2018, PDF, Leather
This item 1294-51 post measures 5/16 L. and is nickel plate. Please feel free to email with any questions.
Tandy Leather Tubular Rivet 100 Pack Nickel Plate 5/16 1294-51
This item 11320-12 measures 9/32 (7 mm) in diameter and is nickel plated. Each size of domed rivets have there own setter, the setter for these 9/32 (7 mm) is 8084-00. These decorative rivets work best on leather that is 8 to 10 ounces or is heavy.
Tandy Leather Domed Rivets 7mm Nickel Plated 100 Pk 11320-12
Leather hardware - Standing Bears Leathercraft Hardware
Tandy Leather Double Cap Rivets Large Nickel 100 Pk 1375-12
Tandy Leather Double Cap Rivets Medium Nickel Plate 100/pk 1373-12 : Arts, Crafts & Sewing