The No. DSRN0615 from Master Lock Single cylinder deadbolt (thumb turn inside) - Includes Nightwatch unauthorized key lockout system BumpStopTM technology - bumpstop resistant cylinder Six-way adjustable latch fits all doors: 2-3/8in (60mm) or 2-3/4in (70mm) backset, square, rounded corners, or drive-in Full 1in (25mm) solid core throw bolt for strength