Free wheel

This ball caster is ideal to be used as the 3rd wheel for your small robots.
Specifications
? Ball diameter: 16 mm
? Ball protruding height: 5 mm
? Total height: 22 mm
? Total length: 40 mm
? Total width: 32 mm
? Mounting hole spacing: 40 mm
? Mounting hole diameter: 4 mm
? Weight: 40 g