Generic Metal Bronze D Ring Buckle 1.5" Inside Diameter Loop Ring for Strap Keeper Pack of 15 D ring inside diameter:1.5" and inside radius :0.9" .Wire diameter:0.16 inches. Material:matal. It is suitable for 1.3"-1.5" width strap. Made of metal material. This D buckle is both component and ornament for shoes, handbags or backpacks