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Types of UPVC Door Handles If your door handle made of uPVC needs replacing it's essential to find the right replacement for your home. Locksmiths can supply and install high-security uPVC door handles that have additional security features. The most important measurements are measurement A (known as PZ) and the length of the backplate (measurement F). Make sure to check these measurements to make sure your new uPVC handles will fit. Lever/Lever A lever is a solid bar that pivots around a central point (know