Compatibility: This train coupler hook box set is suitable for HO 1/87 scale train scenes and can be universally used for 1/87 DC electric train carriage wheel modification, connecting the locomotive with the carriage, and between carriages Material: The product is made of durability metal and pp, ensuring long term use Package Contents: Each package comes with six sets of metal hooks and boxes, providing great value for your purchase Versatile Use: These hooks are great for model train enthusiasts looking to enhance their setups or replace old or broken parts on their model trains Role: The train through the modification, the articulation is smooth and lightweight, the joint is made of pp material does not hurt the model, the column part of the metal to make the overall connection more stable is the accessories for train modification Specification: Material: PP Metal Size Chart: Train Coupler Hook Box:2.2cmx7mm/0.87inchx0.28inch Hook Size:2cmx8mm/0.79inchx0.31inch Package Includes: 6 1/87 Train Coupler Hook Box Set Note: Please allow slightly errors 1-2cm differences due to manual measurement.