DIKAVS 80Pcs Plastic DIY Robot Gear Kit Gearbox Motor Gear Set for DIY Car Robot This gear is covered with a more comprehensive, spindle, single, double, crown gear, pulley, rack, bevel gear, copper gear, bushings, axles, tires, rubber bands and so on 80 kinds of spindle single-layer double-layer worm three-way drying racks are spare parts for toy gears. Mainly used for 0.5 modulus gears, suitable for DIY toys.