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Types of UPVC Door Handles If your door handle made of uPVC needs replacing it's essential to choose the correct replacement for your home. Locksmiths can provide and fit high-security uPVC handles that come with additional 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 your new uPVC handles will fit. Lever/Lever A lever is a solid bar pivoted around a point (known as