 Hi, I'm Constable Jason Doucette, I'm here to provide you with some simple tips on door security and how to keep your home safe. The minimum length of the throw, the distance of the bolt that goes into the door frame should be at least one inch. Anything shorter would not provide the strength required to withstand someone trying to defeat the lock by prying it with a tool or using their body weight to force it open. The surrounding collar of the deadbolt should be made of good quality material and have a freely rotating slip ring. This will make it hard to break or to pry open your door. To prevent any prying of your door frame, interlocking plates are great reinforcements to the security of your door and its frame. To better keep your home safe from intruders, we recommend that these items be installed on all your exterior doors, not just the main entrance. If you're ever in doubt on which lock to purchase for you, please visit your local hardware store or speak to a licensed locksmith for further advice. Help us keep your home safe.