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Types of UPVC Door Handles When your upvc door handle requires replacement, it is essential to find the best replacement for your home. Locksmiths can provide and install high-security uPVC handles that come with additional security features. The most important measurements to take are the measurement A (also known as PZ) as well as the length of the backplate. Check these measurements to ensure your new uPVC handle will fit. Lever/Lever A lever is a rigid bar that pivots around a central point (known as a