Material: Heavy-duty carbon steel body and plastic roller ensure smooth and quiet gliding. PARAMETERS: L: 9cm; W: 3cm; G: 6cm; Roller wheel diameter: 3.5cm, suitable for door thicknesses from 2.5cm to 5cm Advantage: No groove required for the door, no drilling required in the floor Package: 2 Adjustable Floor Guides for double doors (1 door requires 1 piece)