This item is a practical bike trailer hitch designed for towing solutions. It includes a complete hitch arm and hitch connector, making installation simple without the need for additional tools. Unlike standard bicycle towbars, this model features added corrugations at the front and rear to provide a more secure grip on the quick release mechanism. It is ideal for use with children's and dog trailers. Installation method: 1. Install the connecting rod and secure the fixing buckle. 2. Attach the bicycle holder to the left rear hub of the bicycle. 3. Connect the connecting rod and fixing frame, fasten the buckle, and lock the traction rope for double protection. Product Specifications: Material: Carbon steel Weight: 140g Color: Black Dimensions: 54 x 48 x 15mm (2.12 x 1.88 x 0.59in) Shaft hole diameter: 11mm (0.43in) Diameter of recessed area where axle nut is tightened: 18mm (0.70in) Entrance hole diameter at trailer connection: 7mm (0.27in) Package Includes: Bike trailer hitch coupler x 1 Notes: - Due to lighting and screen differences, the actual color may vary slightly from images. - Slight dimensional variations of 0.5–2 cm may occur due to manual measurement. Product Features: 1. High-grade Material: Made from black enamel-coated steel with precision welding for rust resistance, durability, and long-term use. 2. Safe Connecting Design: Attaches securely to rear axles with a locking pin that prevents accidental release, ensuring stability and safety for children and pets. 3. Lightweight & Portable: Compact and lightweight design makes it easy to carry and store. Enables parents to tow kids' trailers conveniently. 4. Easy to Install: Simple setup requiring only basic adjustments—remove or tighten a nut to attach or detach quickly. Compatible with various bicycles and trailers. 5. Widely Used: Suitable for most child and pet trailers, and compatible with many bicycle models. Please verify product dimensions before purchase to ensure proper fit.