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Types of UPVC Door Handles If your door handle made of uPVC requires replacement, it is essential to find the best replacement for your home. A locksmith can offer and install high-security uPVC door handles that come with additional security features. The most important measurements are measurement A (known as PZ) and the length of the backplate (measurement F). Take these measurements to make sure the new uPVC handle will fit. Lever/Lever A lever is a rod that pivots around a point. When you apply force to