• Ideal for communal or flat entrance doors • Push/pull action, preventing accidental lock out • 60mm backset • Supplied with two keys The Yale 81 Rollerbolt Nightlatch front door lock has a rollerbolt for push/pull action, making it ideal to prevent accidental lock out. It is ideal for communal or flat entrance doors, and is opened by a key from the outside and a turn handle operation from inside. The 81 Rollerbolt Nightlatch has a 60 mm backset (the measurement from the edge of the door to the centre of the keyhole). It comes with a 10 year manufacturer's mechanical guarantee and is supplied with two keys. Available in a dark metal grey finish, with a brass or satin chrome cylinder.