SLAYRAD shark badgeSLAYRAD™

SLAYRAD™ Cluster Mailbox Insert — specification sheet

A stainless steel lockbox that fits inside your cluster mailbox compartment. Mail drops in through a slot. Only your key opens it.

SLAYRAD installed inside a USPS cluster mailbox compartment, front plate open showing mail insideSLAYRAD studio shot showing the mail slot, lock, and keySLAYRAD installed inside a cluster mailbox compartment with envelopes in the slot, key in the lockSLAYRAD studio shot, front plate closedThe carrier's view into an open cluster mailbox: SLAYRAD installed in the lower compartment with its mail slot facing out, while the compartment above holds loose mail sitting in the open
Body11-gauge (0.12 in) 304 stainless steel
FitsStandard 4C wall-unit compartments and pedestal cluster boxes about 12 in wide, 3 in tall and 15 in deep. The fit is deliberately tight.
Mail slot3/4 × 9 in
LockGilbarco 500S cylinder — the same lock used on the door of a Gilbarco Encore fuel dispenser. Backed by 4 decades of lock security innovation. Procured and assembled in Corona, California. Locks and keys come only from us, by your lock number.
KeysTwo keys included. Lose a key? Order a Lock Replacement Kit from our Parts page: a new lock and new keys, so the lost key no longer fits.
Hold3M™ VHB™ Tape Max-110GF structural tape — 395 psi overlap shear on stainless steel, 275 psi tensile (3M technical data sheet, Nov 2025).
InstallSlides in and bonds to both side walls with 3M structural tape. Hinge nuts snug with a 3/8 in or crescent wrench. No drilling. About 15 minutes — estimated by the people who build them. We have not timed a first-time installer yet. Install at 70°F or warmer, per 3M's recommendation; full strength after 72 hours.
Weight5 lb
FinishBrushed stainless
Made inBuilt in Murrieta, California. Lock cylinders procured and assembled in Corona, California.

HONEST LIMITS

What it deters — and what it doesn't

Stops

  • A drilled, pried or snapped compartment lock
  • A stolen or copied master key that opens the whole cluster unit
  • Fishing letters out of an open compartment
  • A pried or bypassed carrier door

Does not stop

  • Packages — the insert holds letters, 9 × 12 envelopes, magazines and catalogs only; packages in a parcel locker or on your doorstep are unprotected
  • Very thick flats or bundles that will not pass a 3/4 × 9 in slot; your carrier may leave those loose in the compartment
  • Theft of mail before it reaches your box, including outgoing mail dropped in a blue collection box
  • A cluster unit that is pried open, cut, or carried off whole
  • A carrier being robbed of an arrow key
  • Mail fishing from other residents' compartments

Contact

SLAYRAD LLC · Menifee, California · sales@originalslayrad.com

SLAYRAD™ is not affiliated with or endorsed by the United States Postal Service. No lock is 100% theft-proof.

"USPS", "STD-4C" and "Gilbarco" are used only to describe compatibility and componentry. SLAYRAD™ is not affiliated with or endorsed by any of them.

Print this page (Cmd/Ctrl+P) or save as PDF.