The Clip Cose buckle, 30mm in dark blue, is a quick-release plastic buckle, composed of two pieces that snap together, used to close belts, backpack straps, collars, and other accessories where an easy, one-handed closure is desired. The dark blue tone is a discreet and versatile choice, suitable for backpacks and everyday accessories. It is a very common accessory in leather goods and sewing projects for functional accessories.