This is a window roller, flat edge, sliding, suitable for use with: adore highlight sliding windows, 7/16 in. roller diameter, 5/32 in. roller width, plastic/nylon. Includes: (4) rollers and axle pins. This flat nylon constructed roller is used on adore highlight sliding windows. The roller has a diameter of 7/16 in. Nylon axle pins also act as a side guide. Installs two per window.