A tubular latch door lock is a type of internal door lock that is commonly used in residential and commercial buildings. It is a type of latch mechanism that is operated by a door handle or knob and is designed to keep the door closed and provide privacy.

The tubular latch lock consists of a cylindrical body, usually made of metal, that is inserted into a hole in the edge of the door. The latch mechanism is spring-loaded, which means that it automatically returns to its original position when the door is opened. When the door is closed, the latch bolt extends into the strike plate on the door frame, holding the door securely closed.

Tubular latch locks are often used in conjunction with door handles or knobs, which are used to operate the latch mechanism. The door handle or knob is connected to the latch bolt via a spindle, which allows the latch to be retracted when the handle is turned.

Tubular latch locks are relatively easy to install and are available in a range of sizes and finishes to suit different types of doors and décor. They are commonly used on internal doors, such as bedroom doors, bathroom doors, and office doors, where privacy and security are important. 

There are several benefits to using a tubular latch door lock on your interior doors:

1. Security:  Tubular latches provide a basic level of security for your interior doors, keeping them closed and preventing unauthorized access to your private spaces.

2. Easy to operate:  Tubular latch locks are simple to use and can be operated with a door handle or knob. This makes them a convenient option for use on interior doors that require frequent access.

3. Easy to install:  Tubular latch locks are relatively easy to install and can be fitted into the edge of the door using basic tools. This makes them a cost-effective option for homeowners and businesses looking to secure their interior doors without having to invest in expensive lock systems.

4. Versatility:  Tubular latches are available in a range of sizes and finishes, making them suitable for use on different types of interior doors and in a variety of settings. They are also compatible with a wide range of door handles and knobs, providing greater flexibility in terms of design.

5. Cost-effective: Tubular latch locks are an affordable option for securing your interior doors. They are typically less expensive than other types of locks, such as mortice locks, deadbolts or electronic locks, making them a popular choice for homeowners and businesses on a budget.