The Gainsborough stronghold (G3 series) deadbolts are available in both double cylinder (850) and single cylinder (845).                                                                                                                                  

Features

• Heavy duty, single cylinder deadbolt. 
• Satin stainless steel finish.
• Key locks and unlocks outside, turn snib unlocks inside.
• Suits door thickness 35-45mm.
• 25mm bolt throw.
• Adjustable 60/70mm backset.
• Heavy duty, saw resistant bolt.
• Silca TE2 keyway, rekeyable.
• Supplied with 2 keys.