Improve the looks and performance of your cars and locos with these working knuckle couplers. Each style features "delayed action" uncoupling for more realistic operation. All couplers are made of plastic and include complete, detailed instructions for easy installation. Large offse coupler for LGB 0-4-0 small steam, 0-6-6-0 CC Tank Mallet, Switcher, Industrial switcher, Track Cleaning Locomotive, Track Maintenance and Fire Department, GE6/6 RhB "crocodile" and Kalamazoo 0-4-0 locomotives #27 and #54.