Red-Lock (CTL-4) is a tension bolt lock developed for use with the Bolt Tight to meet the demands of even the hardest-hitting drummers. While Bolt Tight is enough for most players, Red-Lock ensures that even the hardest rimshots wonåft loosen your tension bolts. Tension bolt play occurs mostly around the spot a stick strikes. The moment the hoop sinks from the force of a rim shot, the bolt becomes free and able to turn. This is when the Red-Lock comes into play, holding the bolt to prevent turning. The Red-Lock is compact and will never stick out from lugs or get in the way of drum storage, even in your custom-sized cases. By combining Bolt-Tight and Red-Lock, you have our ågIron-Wall Guardåh to ensure that even tuning and consistent sound are retained through even the most punishing performances.