Thule 3D Dropout SpacerThe Thule 3D Dropout Spacer enables you to attach a bicycle trailer kit to bicycles with hooded dropouts. It offers simple and easy installation, so you can get back on your bike as soon as possible!FeaturesThule part number: 20110723Size:10mm spacerWarranty: Lifetime provided by Thule | Thule 3D Dropout Spacer Black, for Hooded Dropouts