Product Description The fits standard axle hitches for bicycle trailers. So you can attach your bike trailer to your bike. Specifications:Over Locknut Dimension:135 mm, 142 mm, 148 mm, 177 mm, 197 mmAxle Diameter:12 mmTechnical Information:Use:12 x 135 mm, 12 x 142 mm, 12 x 148 mm, 12 x 177 mm, 12 x 197 mmType:thru-axleAxle Material:AluminiumAxle Length:165 mm, 167 mm, 178 mm, 180 mm, 198 mm, 209 mm, 217 mm, 229 mmNominal Diameter:M12Thread Pitch:1 mm, 1.5 mm, 1.75 mmFeatures:thru-axle with integrated adapter for trailer hitchesfor standard axle hitchesModels:12 x 165 mm / 1.5 mm: Over Locknut Dimension:135 mmThread Pitch:1.5 mmManufacturer Number:122530318 12 x 178 mm / 1.5 mm: Over Locknut Dimension:142 mm / 148 mmThread Pitch:1.5 mmManufacturer Number:122530518 12 x 180 mm / 1.75 mm: Over Locknut Dimension:142 mm / 148 mmThread Pitch:1.75 mmManufacturer Number:122530818 12 x 181 mm / 1 mm: Over Locknut Dimension:142 mm / 148 mmThread Pitch:1.0 mmManufacturer Number:122500220 12 x 198 mm / 1.75 mm: Over Locknut Dimension:142 mm / 148 mmThread Pitch:1.75 mmManufacturer Number:122530918 12 x 209 mm / 1.5 mm: Over Locknut Dimension:177 mmThread Pitch:1.5 mmManufacturer Number:122530618 12 x 209 mm / 1.75 mm: Over Locknut Dimension:177 mmThread Pitch:1.75 mmManufacturer Number:122531118 12 x 217 mm / 1 mm: Over Locknut Dimension:177 mmThread Pitch:1 mmManufacturer Number:122530218 12 x 229 mm / 1.5 mm: Over Locknut Dimension:197 mmThread Pitch:1.5 mmManufacturer Number:122530718 12 x 229 mm / 1.75 mm: Over Locknut Dimension:197 mmThread Pitch:1.75 mmManufacturer Number:122531018Contents:1 x 1 x spacer Manufacturer: Croozer GmbH An der Hasenkaule 10 50354 Hürth Germany info@croozer.com