Prime-Line U 10309 Swing Bar Lock for Hinged Doors – 3-7/8 in Bar, Diecast Zinc, Bronze Finish

Secure, simple, and reliable door safety

Enhance daily doorway security with the Prime-Line U 10309 Swing Bar Lock. This compact, sturdy bar lets you open a hinged swing-in door just enough to greet visitors, check the outside, or let a light breeze through, while keeping the door firmly secured at your chosen gap. The classic bronze finish complements most interior and exterior door hardware, providing a subtle, durable look that fits home or rental settings.

Key benefits

• Secondary security for hinged swing-in doors, helping you control the opening
• Allows safe viewing and ventilation without fully opening the door
• Installs out of reach of children when positioned appropriately for added safety
• Quick and straightforward installation with included fasteners and spacers
• Durable zinc diecast construction with a timeless bronze finish

How it works

When the door is closed, the long hinged bar engages the catch to hold the door at a small, secure gap. To see who’s outside or to air the room, simply tilt the bar to create a controlled opening. The bar folds neatly against the door when not in use, keeping a tidy profile.

For added confidence, the lock is designed to withstand regular use and is built from sturdy diecast zinc with a classic bronze coating that resists wear over time.

Product details at a glance

• Bar length 3-7/8 inches, height 2-1/2 inches
• Diecast zinc construction with bronze finish for durability and style
• Includes installation fasteners and two plastic 1/8 shims for offset jambs
• Quick mounting on standard hinge swing-in doors

Real world use scenarios

• Apartment entries where you want to greet guests without fully opening the door
• Front doors in multiunit buildings to improve ventilation while maintaining control
• Homes with children where the bar is mounted higher for added safety
• Rental properties needing a reliable, low-profile security addition

Note that this device is a secondary security measure and should complement, not replace, primary door locks. Finish and dimensions follow standard line drawings for reference.