The Key Ninja organizes your keys like a Swiss Army knife, preventing them from becoming a huge wad of metal in your pocket. And despite its slim, half-inch thick silhouette, the Key Ninja can expand to fit up to 30 standard house keys.The handy tool also boasts built-in dual LED lights (so you can see your lock at night) and a bottle opener because you never know when a cold one might come your way. "S" hook included to ensure you can attach a larger key fob.