A simple door handle is used to open the door. Traditionally, it has a bolt or spindle that goes through it, such as it is located just above the spindle or the cylinder connected by the bolt. When the handle turns, the cylinder turns in the same direction. At the end of the cylinder there is a latch that protrudes into the space carved out of the frame. So turning it will pull the latch out of the carved space that opens the door. Otherwise, if the latch is not pulled out; So the door won\'t open. Glass door handles are considered treasures of the past and are still sought after by collectors and repairers. The history of these treasures dates back to the beginning of 1800. Although the feeling and appearance of the glass has changed a lot compared to the antique and retro versions, the glass is still being manufactured. The old version/model looks more water than today\'s crystal clear replicas. The treasures were developed in 1826, but before the United States joined World War I, the technology to produce them was not popular because of metals like iron; The first world war required bronze and brass to make aircraft and other weapons. By the end of 1920, door handles made of glass and crystal were widely manufactured and sold. To install a new glass door handle on the door, drill holes with a drill bit. After removing one of the handles and the flange or nut, insert the handle into the hole. Insert the bolt into the hole and replace the flange and handle or bolt. If an existing handle is replaced with a new handle, remove the existing handle and insert the new handle to see if the flange covers the hole. If it does not cover the hole, you can get extra accessories from the hardware store to cover it. Measure your size, your glass door handle, buy two new accessories that fit the glass door handle, and it will completely cover the existing holes on the door. Buy a new bolt or cylinder that can fit the door handle and measure correctly. After tightening the two handles, check if the distance between the fittings is exactly the same as the thickness of the door. Sometimes you also have to cut the bolts into the required size with a metal saw.