Arrow AM12BD26D-RH Satin Chrome US26D Right Hand Grade 1 Storeroom Mortise Knob Lockset With Rose, specially designed for heavy duty use, like in, hospitals, and commercial buildings where security, durability, and low maintenance are required. This lock is UL/cUL listed for A labeled doors or lesser, it's ANSI A156.13 Series 1000, operational Grade 1 certified, and it meets FF-H-106C, Series 86 and 87. This mortise lockset features a 2-3/4" inch backset, it fits standard doors 1-3/4" thick, and the armored front is made of heavy gouge steel, 8" x 1-1/4" x 3/32". Accomodates flat doors and doors beveled 1/8" (3mm) in 2" (51mm). The face plate is made of wrought brass or bronze, attached by machine screws to lockcase front. The Latchbolt is constructed of stainless steel, with a 19/32" x 1-1/4" x 1" throw. The Knob is made of nickel steel, 5/16" and 9/32". The strike is constructed of wrought brass or bronze, with an ANSI straight lip standard, 4-7/8" x 1-1/4" and a 1-1/8" lip to center.

Storeroom: Latch operated by rotating inside Knob or key in outside Knob. Outside Knob always fixed.