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BESTGUARD single-cylinder deadbolt lock for compatible doors, with an adjustable 60-70 mm backset. The lock head uses a zinc-alloy housing with a solid brass cylinder; listed parts use 201 stainless steel. It includes three 2.0 mm-thick brass keys and is rated in the source data for 100,000 opening and closing cycles. The materials provide a solid, practical setup for home, room or office door hardware replacement. Before ordering, measure the existing backset from the door edge to the center of the lock hole and confirm 60-70 mm adjustment fits. Also verify door thickness, hole diameter, handing and strike position because these values are not provided. Installation requires accurate alignment; do not force the bolt if it rubs. Test locking and unlocking with the door open first, keep one spare key in a secure place, and periodically tighten screws and lubricate the moving parts with a suitable lock lubricant.