Vacuum N20 Steel Ball Caster Wheel MBOT Smart Car Chassis.
This is a 15mm metal ball with plastic caster case. Smaller balls exist on the sides to provide perfect and smooth rotation of the large one. It is great for DIY kits with two driven wheels (this ball acts like a third wheel). Its height is 20 mm.
Specifications:
Steel ball size and material: Φ 15
Caster material: Nylon
Caster length: 50 mm
Caster pitch: 40mm
3 mounting holes equidistant: 2cm
Mtg. holes center hole to outer edge: 5mm
Fixed hole diameter: 3.1 mm Φ
Wheel overall height (caster and ball): 20 mm
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