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160 Prep refers to a combination of cross-bore and mortise specifications, particularly in relation to the preparation of doors for various types of locks. This specification outlines the necessary dimensions for drilling holes that accommodate both the cylindrical locks and mortise locks. Specifically, the term traditionally indicates a 2-1/8 inch diameter cross-bore centered at 2-3/4 inches from the edge of the door, along with a rectangular cutout for the latch or deadbolt that matches certain industry standards.

Understanding 160 Prep is crucial for ensuring compatibility between the door and lock hardware, which facilitates proper installation and functionality. This standardization helps locksmiths and builders create uniform installations, minimizing errors and ensuring security measures are effectively implemented.

In contrast, the other options focus on specific aspects that do not encapsulate the comprehensive nature of what 160 Prep entails, making them less accurate in describing this particular industry standard.