Specification: Product Type:Trailer Hitch Size:The diameter of the bicycle rear axle mounting hole: 11mm diameter of the mounting hole of the link trailer: 7mm The diameter of the recessed portion where the shaft nut is screwed: 21mm Base plate length: 55mm Weight: 158g Material: stainless steel Type: Child Trailer Model: see picture Colour: black Scope of delivery:1x bicycle trailer hitch with safety pin Coupling Steel Coupling Adapter Safe and reliable: Compared to conventional bicycle trailer hitches, these ensure a better and more secure hold on the quick release Extra robustness and Flexibility: Thanks to the high maneuverability of the trailer, you can also drive the system on winding roads without any problems. This allows you to react in good time to sudden dangers Safety: Due to the low center of gravity, the trailer is less prone to rolling away and tipping over. Even if your bike falls over, the bike trailer stays upright. The coupling thus offers maximum safety for your loved ones ModelDD387RF297JL405543