Arrow E61-26DR Satin Chrome US26D Grade 2 E Series Single Cylinder Deadlocking Drive-In Deadbolt, specially designed with a tamper resistant rotating wrench-proof collar, a steel deadbolt with hardened steel pin insert and concealed screws. This single cylinder uses a turnpiece from the inside to retract and project bolt, and from the outside the key retracts and projects 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" standard for 2-3/8" Drive-In backset. All functions a reversable, for right or left hand applications.