Lowest Prices on Mailboxes, Period.

Signature Keystone Post Mount Locking Mailbox

  • With the Gaines Signature Keystone Locking Mailbox collection it’s easy to get everything you want.
  • Made from cast aluminum and covered with a powder coat pain finish that will never rust, you can count on these locking mailboxes to be low-to-no maintenance.
  • Available in 6 colors and 4 accent finishes creating a unique mailbox designed just for your home.
  • Raised US Mail letters cast a shadow and add dimension to the mailbox front.
  • Letters and Flags are made of solid brass or aluminum and come in Verde Brass, Satin Nickel, Polish Brass and Antique Bronze finishes.
  • Personalize your mailbox by adding your street name and address to the side of the mailbox in 7 year vinyl letters that match the color of the locking mailbox's accents.
  • Need an address plaque for your house? Check out our selection of Gaines HouseMark address plaques which coordinate with our Signature Keystone Post Mount Locking Mailbox collection.
  • Each USPS approved locking mailbox comes with a locking insert and 2 keys. Order yours today!
  • See more Locking Mailboxes.
Available Finishes And Accents
 
Keystone Mailboxes Metallic Bronze Antique Bronze
Metallic Bronze with
Antique Bronze
gmmkssig20a-mbz
Keystone Mailboxes Metallic Bronze Polished Brass
Metallic Bronze with
Polished Brass
gmmkssig4a-mbb
Keystone Mailboxes Metallic Bronze Satin Nickel
Metallic Bronze with
Satin Nickel
gmmkssig24a-mbs
Keystone Signature Mailboxes Black Antique Bronze
Black with
Antique Bronze
gmmkssig21a-blz
Keystone Signature Mailboxes Black Polished Brass
Black with
Polished Brass
gmmkssig7a-blb
Keystone Signature Mailboxes Black Satin Nickel
Black with
Satin Nickel
gmmkssig25a-bls
Keystone Signature Mailboxes All Black
Black with
Black
gmmkssig19a-bl
Keystone Signature Mailboxes White Antique Bronze
White with
Antique Bronze
gmmkssig22a-whz
Keystone Signature Mailboxes White Polished Brass
White with
Polished Brass
gmmkssig1a-whb
Keystone Signature Mailboxes White Satin Nickel
White with
Satin Nickel
gmmkssig23a-whs
Keystone Signature Mailboxes All White
White with
White
gmmkssig15a-wh
Keystone Signature Mailboxes Almond Antique Bronze
Almond with
Antique Bronze
gmkssig26a-amz
Keystone Signature Mailboxes Almond Polished Brass
Almond with
Polished Brass
gmmkssig3a-amb
Locking Insert
 
Gaines Keystone Signature Mailboxes Locking Insert
 
Bottom View - Mounting Holes
 
Keystone Mailboxes Bottom View Mounting Holes
 
Optional Mailbox Posts
 
Gaines Keystone Signature Mailboxes Standard Post
Standard Post
Gaines Keystone Signature Mailboxes Deluxe Post
Deluxe Post
Order Your Mailbox
Our Low Price: $297.00FREE SHIPPING
Availability: In Stock Ships In 1 Day
Quantity
Finish and Accents
Keystone Mailboxes Finish Options More Info
Post
Gaines Keystone Post Options More Info
Side Address
Side Address For Mailboxes More Info
Mailbox Details
Item Number:
  • Mailbox
  • GMMKSSIG
  • Locking Insert
  • GMZMKSLOCKING
Includes:
  • Mailbox
  • Locking Insert w/ 2 Keys
Locking Mailbox Locking Mailbox
Size:
  • 12-1/4"H x 10-3/8"W x 20-1/8"D
Weight:
  • 18 lbs.
Manufacturer:
  • Gaines Manufacturing
Downloads:
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