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Types of UPVC Door Handles If your upvc door handle needs replacing it's essential to find the right replacement for your home. Locksmiths can provide and fit high-security uPVC handles with added security features. The most important measurements are measurement A (known as PZ) and the length of the backplate (measurement F). Make sure to check these measurements to ensure that your new uPVC handle will fit. Lever/Lever A lever is a rigid rod that pivots around the point. When you apply a force to the end