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Types of UPVC Door Handles If your upvc door handle is in need of replacement, it's important to find the best replacement for your home. Locksmiths can provide and install high-security uPVC handles with extra security features. The most important measurements you should take are the measurement A (also called PZ) and the length of the backplate. Please check these measurements to make sure your new uPVC handles will fit. Lever/Lever A lever is a rigid bar that pivots around