Description:Plastic drive wheel with coupling for smart robot crawler tank car chassis DIYAdopt plastic material for durable performance and longer service timePrecisely processing, delicate and smooth

By using it, you can conveniently install your loved tank chassis

You can DIY all kinds of crawler chassis, graduation design

The first choice for electronic enthusiasts

Specification:Material: plasticCoupler Inner Diameter: 4mm/5mm/6mmSeparation Distance: 33mmWheel Diameter: 50mmPackage Includes:1 piece driving wheel1 piece couplingNote:There are 3 types of coupler(Inner Diameter: 4mm/5mm/6mm), you should note the order before purchasing