Mail Time! &reg; Yellow Mailbox Alert Signal Flag for Long Driveways Rust-proof aluminum mailbox flag is powdercoated bright yellow for maximum visibility - perfect for long driveways, rural roads, or obscured view of mailbox. Spring hinge automatically raises flag when mailbox is opened. Fits on any size metal (and most plastic) "bread loaf" type mailboxes where door closes over face of box, including XL Size 2 mailboxes. If mailbox has door latch but not a top latch on the body, simply drill an additional hole on top of box through hole in Mail Time! bracket. Will not work on any mailbox where door fits flush inside the face of the box Simple design is very durable - see reviewers using Mail Time! for years. Always Made in the USA.