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Types of UPVC Door Handles When your upvc door handle is in need of replacement, it's important to choose the correct replacement for your home. A locksmith can provide and install high-security uPVC door handles with extra security features. The most important measurements you should take are the measurement A (also called PZ) as well as the length of the backplate. Please check these measurements to ensure that your new uPVC handles will fit. Lever/Lever A lever is a rigid bar pivoted aroun