General description Set of 8 adjustable shower door rollers, including 4 top and 4 bottom rollers. These rollers are designed for use with bathroom and shower doors, featuring a spring mechanism that allows compatibility with curved doors. Technical specifications Roller diameter: 25 mm Roller width: 6 mm Minimum hole size in the glass: 11 mm Maximum thickness of tempered glass: 6 mm Upper wheel height: 35 mm Upper wheel width: 27 mm Lower wheel height: 33 mm Total height with knobs: 42 mm Lower wheel width: 27 mm Glass edge hole distance: 19 mm Opening: 10-12 mm Suitable glass thickness: 4-6 mm and 9.5-14 mm glass hole Materials: plastic, nylon, stainless steel, copper rod Installation Comes with screws and plastic covers for easy installation. To adjust the pulley, turn the screw clockwise or counterclockwise with a screwdriver. If clamping other glass sizes, cut off the connecting belt of the glass tank as needed. Usage Upper wheel is adjustable and can be turned left and right.