This is a belt loop key holder. The concho used is a Leather Craft Yu original concho (alloy type). (Currently sold on Rakuten for 3180 yen.) The leather is cowhide, with a grain finish on both sides. The metal ring has a diameter of approximately 4.5cm, and the snap for attaching keys is about 3cm with four hooks. ⚫︎Used for about 2 weeks. ⚫︎Size: Length: Approximately 13.5cm (including metal parts), Width: Approximately 3cm, Thickness: Approximately 4mm. Usable belt width is about 3.7cm (about 5.5cm if you don't mind the step). I obtained a different concho and was going to replace it, but it was a bit too big, so I remade the entire belt loop. Therefore, I am selling this one.