Description:Plastic bearing 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: plasticSeparation Distance: 35mmWheel Diameter: 50mmCoupling Hole Size: M4 (Fits for M4 screw)Size Chart:Model A: inner wheel thin and outer wheel thickModel B: inner wheel thick and outer wheel thinPackage Includes:1 piece bearing wheel1 piece M4 coupling