Package includes: 1 piece Bicycle hook + 1 piece buckle. Size: 55*29.7*66mm. Most bicycles can be used. Material: Made of stainless steel. The product is small in size and easy to carry. Stable structure: each bicycle trailer hitch is equipped with a connection pin, the pins can hardly open, also once you install them, they wont fall off easily. Widely application: the bicycle trailer attachment is suitable for most bicycles. Product 1 Piece Steel Bike Trailer Hitch Bike Mount Adapter Connector Bicycle Trailer Hitch for Trailer Cargo Mount Coupler for Most Bike Trailers Specification: Product name : bike hook Material: stainless steel Size: 55*29.7*66mm Quantity: 1 piece Color: black + tape Easy to use: With the complete hitch arm and hitch connector, easy to install without any other tools required. Scope of delivery: 1 piece * bike tow bar 1 piece * con nector Note: 1.Due to the manual measurement, please allow 1-2mm deviation. 2.Please , please feel free to contact us if the product you received is defective or you are not satisfied with our product, we will solve the problem for you in time.