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Types of UPVC Door Handles It is essential to select the right replacement Upvc handle for your home if handles are in need of replacement. A locksmith can offer and install high-security uPVC door handles that have additional security features. The most important measurements you should take are the measurement A (also known as PZ) and the length of the backplate. Make sure to check these measurements to make sure your new uPVC handles will fit. Lever/Lever A