That is one type of bolt that has a place or hole for connecting a padlock. This type has two functions at the same time as an ordinary slot is also used to lock the door with a padlock simultaneously.
This type has a simple form that is, as we often know together, a model or shape has a disadvantage that is easily separated from the slot house. There are various sizes or materials used for this type including iron / steel, galvalum and brass and others.
The model with the chain is a type that is often used for various types of doors, door to house, office, hotel or in various types of doors in other public places. The advantage of this type of chain latch is that it has stronger security than with ordinary slots.
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