Look, they're just replacement wheels for OO-scale coaches, right? What's the point? Well, if your coaches have those horrible plastic wheels, these are a must-have. If you're converting non-lighted coaches to lighted-coaches these are a must-have. If your coach-wheels are out-of-gauge and can't be adjusted (e.g. plastic wheels with square axles), these are a must-have. In short, if you need 12.5-12.6mm metal wheels for your rolling-stock, these are great!
Highly recommended! (They're available in a range of different diameters, check your rolling-stock before you buy).
these 00 scale metal wheels / axles were an ideal replacement for the Triang all plastic ones ; ( modelling skills are needed for replacing the old wheels ).