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 gear building your own gearbox with customized gear ratio.The outer gear diameter is 5mm with 8 teeth.The motor shaft diameter is 2mm.It can be connected with Motor axle diameter 2.0mm .perfect accessories for Vehicle or remote control toys, such as RC airplane toy ,RC helicopter, toy car and so on.Package Contents:30 Pcs x Plastic GearOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.