SummaryThe bike trailer made of heavy-duty steel at an Angle of about 45 degrees, it is suitable for various types of bikes.Hole diameter of bicycle bolt: 11 mm, hole diameter of trailer handle rod: 7 mm, shaft nut screwed into the hollow area diameter: 21 mm, floor length: 55 mm.Bike kupplung is very convenient to use.Simply install a coupling on your bike and you can use it with other bikes/kid bikes/shopping carts.There is also a trailer bolt, mom and dad's bike can tow children car, I think it is a perfect entertainment game.Bike Bicycle Trailer Coupler Attachment Hitch Angled Elbow For InStep DescriptionSpecifications:Colour: Black ,Product accessories; bracket + buckle,Hole diameter of bicycle bolt: 11mm,Hole diameter of trailer handle bar: 7mm,Diameter of the recessed area into which the shaft nut is screwed: 21mm,Base plate length: 55mm,Type: Child Trailer,Material: Steel,Model: Bicycle trailer connector.Include:1x Bike Bicycle Trailer.