Frame material:Alloy Steel, Metal Batteries included?:No Package Dimensions:14 x 12 x 3 cm; 200 Grams Features: Made of high-quality alloy steel, corrosion-resistant and not easy to damage. Small size, easy to put in your pocket for outdoor activities. Easy to install or remove this bike trailer hitch from your bike. Vertical or horizontal hole design, suitable for most bicycles. Wide range of applications, suitable for baby carriages, pet carriages and small cars. Installation steps: 1. Open the quick change lever and remove the nut and spring from the other side. Hold the lever and pull the pivot pin out with the spring. Remove the skewers completely, but leave the wheels in place. 2. Slide the hook onto the skewer. (The wide end of the spring should face out and touch the lever, and the hook bell should face out.) 3. Insert the end of the skewer into the hub and secure. Put the spring (wide end!) on the end of the skewer, then the nut. 4. Set the clutch at the correct angle, then hand tighten the nut and clamp the lever. Use the Q/R pins to attach the trailer to the hitch. Packing List: 2 X Bike Trailer Hitch 2 X Locks with D-pin Note: 1. Due to light, there may be a certain color difference between the real object and the photo. Please refer to the actual product. 2. Due to manual measurement, the actual product may have certain size errors. Please refer to the actual product. 3. If you have any questions about the use of the universal bicycle trailer hitch, please contact us in time. "" The bike hitch adapter is made of high-quality metal, sturdy and durable, not easy to deform, corrosion-resistant and not easy to damage, it can be used for a long time. Easy to CarryThe bicycle connector is small and compact, and can be easily carried around for outdoor activities. Perfect for everyday shopping, transporting supplies, or the daily commute. Easy to Install No other tools needed, just take a few seconds to remove or tighten the nuts. Then you can complete the installation of this bicycle trailer accessory, which brings you more convenience. Safe & Flexible This hook fits perfectly on tow bars and is very flexible. Whether your bike is riding on smooth roads or rough mountain trails, the trailer won't wobble or tip over easily. Widely Used The universal bike tow bar is compatible with most bicycles, such as mountain bikes, folding bikes and electric bikes. It is also suitable for pet strollers, multi-purpose strollers, strollers and cargo strollers. The bike hitch adapter is made of high-quality metal, sturdy and durable, not easy to deform, corrosion-resistant and not easy to damage, it can be used for a long time. Easy to CarryThe bicycle connector is small and compact, and can be easily carried around for outdoor activities. Perfect for everyday shopping, transporting supplies, or the daily commute. Easy to Install No other tools needed, just take a few seconds to remove or tighten the nuts. Then you can complete the installation of this bicycle trailer accessory, which brings you more convenience. Safe & Flexible This hook fits perfectly on tow bars and is very flexible. Whether your bike is riding on smooth roads or rough mountain trails, the trailer won't wobble or tip over easily. Widely Used The universal bike tow bar is compatible with most bicycles, such as mountain bikes, folding bikes and electric bikes. It is also suitable for pet strollers, multi-purpose strollers, strollers and cargo strollers.