Product Description This thru-axle allows you to attach a bicycle trailer to bikes with 12 mm rear axle from Shimano. Product Specifications: Application:Kids black | 170 mm: dropdown:170 mm black | 172 or 178 mm: dropdown:172 or 178 mm black | 229 mm: dropdown:229 mm black | 159 or 165 mm: dropdown:159 or 165 mm Product Features: easy and quick installationThread pitch: M12 x 1.5 Manufacturer Number: black | 170 mm: 20100766 black | 172 or 178 mm: 20110734 black | 229 mm: 20110738 black | 159 or 165 mm: 20110801 Contents: 1 x Thule thru-axle Manufacturer: Thule Sweden AB Borggatan 5 335 73 Hillerstorp Sweden B2C.de@thule.com