Knob entry door lock, model F51VPLY716A. A straightforward replacement or upgrade for keyed entry doors, built for reliable everyday use. Key benefits Secure keyed entry function that restores or provides controlled access for doors requiring a lockable knob. Easy retrofit: designed to work with standard bored door preparations to simplify replacement of existing knob hardware. Durable, dependable operation for frequent use in residential and light commercial settings. Compact design that fits typical door layouts without extensive modification. What it does and why you need it Provides a keyed locking solution for exterior doors, entryways, and areas that require restricted access. Solves common problems such as worn or malfunctioning knobs, lost keys, and outdated hardware by offering a direct, practical replacement option. Improves daily usability with smooth turning action and consistent latching to keep doors secure and functional. Important attributes Function: keyed knob entry lock for controlled access. Compatibility: intended for standard residential and light commercial door preparations and typical door thicknesses; suitable for retrofit applications. Size and fit: compact knob profile designed for minimal door modification during installation. Material and performance: engineered for regular use with reliable mechanical operation and longterm fit. Use scenarios a worn exterior entry knob on a singlefamily home to restore keyed access and secure the entrance. Update locks in a rental unit or multifamily property during a turnover to ensure reliable access control for tenants. Install on an interior office or storage room door where keyed access is required to protect equipment or sensitive materials. Includes manufacturer part number F51VPLY716A for accurate identification when ordering or matching replacement parts. Designed for practical installation and consistent daily performance without unnecessary complexity.