uxcell 20Pcs 4.5mmx0.9mm 8 Teeth Thick Motor Spindle Spur Gear for DIY Robbot Product Name : Plastic Motor Spindle Gear;Type : Single Gear;Fit for : for DIY Toys Motor Reduction Box Teeth : 8;Modulus : 0.5;Diameter : 4.5mm/0.18" Thickness : 5mm/0.2";for Shaft Dia : 0.9mm/0.035" Material : Plastic;Color : White Weight : 2g;Package Content : 20 Pcs x Plastic Motor Spindle Gear