The round door knob for the front door interchangeable set is made of stainless steel. Thanks to the use of stainless steel, this rotatable door knob has a long service life, and this knob has also been brushed and therefore has a matt appearance. The knob has a diameter of 53 mm and the base plate 53 mm. The included mounting material makes installation very easy. The rotary change pin is used for a change set with a fixed button on the outside of the door and a movable handle on the inside.