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Types of UPVC Door Handles If your door handle made of uPVC is in need of replacement, it's important to find the right replacement for your home. Locksmiths can supply and install high-security uPVC door handles with extra security features. The most important measurements you should take are the measurement A (also known as PZ) along with the length of the backplate. Check these measurements to ensure that your new uPVC handles will fit. Lever/Lever A lever is a solid bar pivoted around a point (known as