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A low-profile, heavy-duty 20mm metal ball caster designed for autonomous robots. Unlike plastic casters, this stainless steel ball provides smooth 360-degree rotation and extreme durability, making it the perfect "third wheel" for Arduino and Raspberry Pi robot chassis. Quality assured by Pro Tronix.

A high-durability 50mm polyamide caster wheel designed for smooth movement and industrial-grade reliability. Featuring a 20mm wide tread, this wheel offers excellent chemical resistance and high load-bearing capacity, making it the perfect choice for mobile robot bases, flight cases, and workshop equipment. Quality assured by Pro Tronix.