Product Name: Plastic Gear;Type: Single Gear;Fit for: for DIY Toys Motor Gearbox ShaftTeeth: 8;Modulus: 0.5;Total Dia: 5mm/0.22"Thickness: 5mm/0.2";for Shaft Dia: 2mm/0.08"Material: Plastic;Color: WhiteWeight: 3g;This is a plastic tools building your personal gearbox with customized tools ratio.The outer gear diameter is 5mm with 8 teeth.The motor shaft diameter is 2mm.It could be connected with Motor axle diameter 2.0mm .perfect equipment for Vehicle or remote control toys, such as RC plane toy ,RC helicopter, toy vehicle and so on.Package Contents:30 Pcs x Plastic GearOnly the above kit content, other merchandise aren't included.Note: Light taking pictures and varied reveals may cause the colour of the object within the photo a bit various from the real thing. The measurement allowed error is +/- 1-3cm.