The set of upper and lower trolleys is a set of pieces that have the function of supporting the doors of a closet and making it possible to slide them along the rail. These are made of steel and aluminum so they are capable of supporting up to a sheet of 85 kg with 50 mm maximum thickness due to design. These pieces are designed for soft closing and can be purchased for both exterior and interior closet doors. They are fixed by means of 8 mm diameter screws, have graduation to level them and their packaging is a complete set of pieces. It should be noted that depending on the thickness of the panel you can purchase them with a separation distance of less than 50 mm