Arrow E62-26DL Satin Chrome US26D Grade 2 E Series Double Cylinder Deadlocking Deadbolt, specially designed with a tamper resistant rotating wrench-proof collar, a steel deadbolt with hardened steel pin insert and concealed screws. This Double cylinder from the inside uses a key to retract and project the bolt, and from the outside the key retracts and projects the bolt. This deadbolt has a two piece housing, with free spinning outer ring to prevent wrenching. This lock is ANSI A156.5, Auxiliary Locks, Grade 2 certified. The thru-bolting is supplied with two 1/4" steel thru-bolts. There is a 1" solid steel deadbolt throw with hardened steel pin insert. For doors 1-3/8" to 1-3/4" inches thick. The Strike is supplied standard with #346 security strike for metal frame. the deadbolt front is 2-1/4" x 1-1/8" standard for 2-3/4" backset. All functions a reversable, for right or left hand applications.