Buckle size is the width of webbing that it will take (eg a 16mm buckle takes 16mm wide webbing). 16mm = 34mm. 20mm = 41mm. 25mm = 55mm. The colour on these can vary slightly from item to item. Other options are available.
Waistcoat Buckle Antique Brass / Bronze Tone Pack Size 1,2,5,10,25pcs
40mm Metal Belt Buckle Premium Grade Antique Brass Gunmetal 5–100pcs
West End Buckle Solid Brass Belt Buckle 9 Sizes - 0.5" - 2" inch
40mm Engraved Western Belt Buckle Antique Silver 1.5 Inch Strap
Antique Brass Tape Measure 18ft Long Cloth Tape Measure 5cm Diameter
Antique Brass Book Corner Lock Set with Ornate Hinges – Vintage Book Hardware