Product Description:Name: Plastic Shaft Single Layer GearsModel: 0.5MMaterial: PlasticHole diameter:1.4mm(Tightly matched with 1.5mm shaft)Thick:5mmOuter diameter: 5mmUsed:Do DIY science and small production, product design, mechanical model.Remarks: If you've got special needs, please contact us, we will customize according to your needs!The records is measured manually, for reference only, please talk to the real object!Package Include:According to your Choose!