Deadbolts
“Deadbolts are the stalwarts of home security,” says Klimaszewski. “They come in single and double-cylinder varieties. Single-cylinder deadbolts are great for exterior doors, while double-cylinder deadbolts, requiring a key on both sides, are ideal for doors near windows.”
A deadbolt provides two-tier security, because it’s almost always installed on a door with an existing knob lock. An extra-long barrel penetrates deep into the door jamb, making it virtually impossible to force the door open with a crowbar.
Article source here: 8 Types of Door Locks To Keep Your Home Safe
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