Specification Brand : uxcell BulletPoint1 : Total Size: 13 x 5mm/0.5" x 0.2"(D*T); Solt Width: 1.5mm BulletPoint2 : Hole Dia.: 2mm/0.08"; Country of Manufacture: CHINA BulletPoint3 : Material: Plastic; Net Weight: 20g BulletPoint4 : Package Content: 50(+/-2%)pcs x Belt Pulley; Main Color: Black BulletPoint5 : Product Name: Belt Pulley ExternallyAssignedProductIdentifier1 : 0609876042048 ExternallyAssignedProductIdentifier2 : 609876042048 ItemName : uxcell 50pcs 13mm Dia Plastic Belt Pulley Black for DIY Model ItemPackageDimensions_Height : 11.7 centimeters ItemPackageDimensions_Length : 4.5 centimeters ItemPackageDimensions_Width : 9.9 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : motor-accessories Manufacturer : uxcell Material : Plastic Material1 : Metal Material2 : Graphite ModelNumber : a17052200ux0403 PartNumber : a17052200ux0403 ProductDescription : Feature:plastic belt pulley, 13mm diameter, 2mm aperture, and it is fit for 1.2mm width belt. The motor shaft diameter is 2mm. It can be connected with Motor axle diameter 2.0mm .