Use these general purpose casters in a variety of applications. Their durable glass-filled nylon wheels are impact and wear resistant and can operate in a wider temperature range than other nylon wheels. They work well on smooth surfaces. The wheels have sleeve bearings to prevent wear to the wheel bore, but these don't roll as easily as other bearings. Double-ball swivel bearings provide the smoothest swiveling and are shielded for protection from dust and debris.