The Poly Grip Lock is a cam-type locking system. This lock was designed for installation with 2 layers of 6 mil poly that is air inflated. It is a simple and secure lock with a track record of dependability. The lock consists of an aluminum base channel and aluminum locking ring. The ring is easily inserted into the base for quick application. This system is not flexible (bendable) and cannot be used on gable ends of quonset houses.