1.5" Black Electroplate Rectangular Triglide Slide Buckle with rounded profile for 1.5" webbing or strapping.  

Black oxide electroplate webbing / strapping adjuster buckle. 4.5mm Wire  

adjustable double slide pin buckle available in nickel, antique brass, and black nickel. Used primarily for vests but also found on bags, belts, shoes, and more. Inner width: 20mm

Brass plated cast zinc web slide buckle.