International Advisory Service, Ltd. (IAS) is a family-owned manufacturer of custom brass hardware for the high-end leather goods and accessories trade. Founded in 1945, the company serves global brands and smaller manufacturers, drawing on more than 75 years of industry experience. IAS helps customers design, develop, and integrate hardware into their production lines, with in-house manufacturing that supports quality control from initial design through full-scale production.

Its offerings include custom hardware, in-stock and bulk products, buckles, swivel snaps, closures, locks, zippers, and leather gauges. IAS also distributes Riri Group products to North America. For custom projects, the process begins with a consultation and design development, using customer sketches, CAD drawings, or physical samples. IAS then creates 3D drawings and printed plastic samples, followed by final samples and production. The company can accommodate both small and large orders and arrange worldwide delivery. With locations and operations spanning Massachusetts, Hong Kong, and China, IAS combines product development support with manufacturing and supply services for the fashion industry.