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Types of UPVC Door Handles It is crucial to select the correct replacement Upvc handle for your home when your handles are in need of replacement. can supply and fit high-security uPVC handles with extra security features. The most important measurements are measurement A (known as PZ) and the length of the backplate (measurement F). Check these measurements to ensure that your new uPVC handle will fit. Lever/Lever A lever is a rigid bar that is pivotally positioned around a point (known as a the fulcrum).