The KEYMAN M700 Series Escutcheon Mortise Lock is an extra heavy-duty commercial lock. With stainless steel bolts and high-strength steel alloy internal parts, it features a UL-listed 3-hour fire rating and meets ANSI/BHMA A156.13 Grade 1 standards. Its 3-5/8" (92mm) cylinder-to-spindle dimension enables easy retrofitting of most locks with minimal door prep, maximizing replacement flexibility.