In Active Hoppe Mortise Flush Bolt 40006463 Locks 6 cubic feet of internal

6 cubic feet of internal space on the inside

the SEM 7830 is surface wall-mounted

Also available is the "Hockey Puck" style shackle-less padlock (TR100) which is an extra level of protection since there is no shackle exposure

Hoppe Mortise Single Point Lock - 14mm Deadbolt Throw

90 degree with Crescent Knob for a 2-1/2”  thick door

In Active Hoppe Mortise Flush Bolt 40006463 Locks 6 cubic feet of internalHoppe Mortise Flushbolt in Stainless Steel, 1. 18" Backset The inactive flushbolt version provides a simple solution for securing inactive panels of French doors. Edge mounted, the lockset activates the rod extensions which secure the door at both head and sill. Model: 850 40006463