Whitco Deadlatch Twin Pack - (Timber Door)Pack of 2 double cylinder deadlatches, opened by key from outside and turn knob from the inside. Suitable for timber doors that open inwards. Features Satin chrome pearl finish. Safety release (automatically unlocks the internal knob upon entry) Inside knob free at all times. Suits door thickness 30 45mm. 60mm backset. 11 concealed anchorage points. Door frame strengthener. Compatible with most restricted keying systems.