Gaines Keystone Post Mount Locking Mailbox

Gaines Original Keystone Post Mount Mailboxes
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Retail Price:$358.62
Our Price:$311.84
  • Free Shipping
  • In Stock
  • Ships in about 1 to 3 business days.
  • Gaines Keystone Post Mount locking mailboxes is one of our top selling residential mailboxes. With 28 different finish combinations and so many post mounting options it’s easy to see why.
  • Made from durable cast aluminum and finished with a next generation powder coating, this mailbox is virtually maintenance free. Wipes clean and will never rust.
  • Powder coat is available in several color options and complimented by antique bronze, verde brass, polished brass and satin nickel accents for a unique locking mailbox that looks exactly the way you want.
  • Add your address to the side of the mailbox in matching accent colors for a personalized look.
  • Look to Gaines products for lasting beauty and style. Complete the look of your home’s exterior with a Gaines HouseMark Address Plaque, available to match your mailbox.
  • Locking insert has an ample sized slot for daily mail delivery and protects you and your loved ones from the threat of identity theft. Comes with 2 keys.
  • Designed for long-life and USPS approved, Gaines Keystone Post Mount locking mailbox is the only mailbox you’ll ever need
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Finishes and Accents

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Product Options

Product Details


Item Height (inches) Width (inches) Depth (inches)
Mailbox 12.25" 10.375" 20.125"


  • Mailbox Item Number: GMMKS
  • Locking Insert Item Number: GMZMKSLOCKING
  • Includes: Mailbox, Locking Insert with 2 Keys
  • Manufacturer: Gaines Manufacturing
  • Shipping Weight: 18 lbs.
  • Locking: Locking mailbox.
  • Parts: We sell replacement parts for this product.

Additional Images

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