Ideal for communal or flat entrance doors, this Yale 81 Rollerbolt Nightlatch front door lock features a rollerbolt for push/pull action to prevent accidental lock out. It is opened by a key from the outside and a turn handle operation from the inside. The nightlatch has a 60mm 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 metallic grey finish, with a brass or satin chrome cylinder. Dimensions: 70H x 92W x 27D mm. Handle Projection: 14mm. Case Finish: Dark Metallic Grey. Weight: 2.425084882 Pounds.