Tiger closures are great for the assembling of KoolDuct and allow you not to use the glue. The problem is its almost impossible to bend the tiger closure in a true 90 degree angle. To combat this, bend the tiger as normal then use a dead blow hammer to set the closure. Doing so will bend the tiger over 90 degrees. The duct will be more robust and considerably squarer. Also, the tape will cover the tiger flawlessly.