Product Name: Plastic Gear;Type: Single Gear;Fit for: for DIY Toys Motor Gearbox Shaft Teeth: 8;Modulus: 0.5; Dia: 5mm/0.22" Thickness: 5mm/0.2";for Shaft Dia: 2mm/0.08" Material: Plastic;Color: White Weight: 3g; This is a plastic gear 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 Gear Only 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.