Corbin Russ win ML2053-NSA-626-LC is a Grade 1 mortise lock designed to meet the rigors of high-traffic commercial, institutional, industrial and government applications. Constructed of heavy-gauge steel, the lock body features a patented Quick Reversible latch bolt, so the lockset can be re-handed without disassembling the lock case. The 10-year warranty lends to its versatility and reliability, making it the ideal choice for use in offices, schools, hospitals, hotels and other high-use applications. Door Thickness 1-3/4" (44mm) standard. Backset 2-3/4" (70mm). Lock case is Heavy-gauge steel, 5-7/8" (149mm) x 4" (102mm) x 15/16" (24mm). Front is heavy-gauge steel, 8" (203mm) x 1-1/4" (32mm) x -3/32" (2mm). Accommodates flat doors and doors beveled 1/8" (3mm) in 2" (51mm). Furnished 1-1/16" (27mm), Armored Front is wrought brass, bronze or stainless steel attached by machine screws to lock case front. Latch bolt is a 2-piece mechanical with anti-friction insert, 5/8" (16mm) x 1" (25mm) x 3/4" (19mm) throw. Strike plate is wrought brass, bronze or stainless steel, ANSI straight lip standard, 4-7/8" (124mm) x 1-1/4" (32mm) x 1-1/8" (29mm) lip to center. Warranty is 10-year limited. Certification/Compliance ANSI/BHMA Certified A156.13 Series 1000, Operational and Security Grade 1. Meets A117.1 Accessibility Code. Federal Meets FF-H-106C. UL/cUL-UL10C Positive Pressure. All locks listed for A label and lesser class doors, 4' (122cm) x 10' (305cm) single or 8' (244cm) x 10' (305cm) pair (3 hour fire door). Letter F and UL symbol on armored front indicate listing.