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Types of UPVC Door Handles When your upvc door handle needs replacing it's essential to choose the correct 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 known as 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 rod that pivots around the point. When you apply