The Clip Cose buckle, 30mm and black, reference 140221, 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. This alternative reference in black corresponds to a different model of clip buckle within the same 30mm range, maintaining the same quick-release functionality. It is a very common accessory in leather goods and sewing projects for functional accessories.