Two heavy duty carriages are listed to suit Glidemaster™ sliding doors, both rated at 100kg: a carriage, roller and anti-bounce guide set, and a top-fix carriage and roller. Both are also listed against Masterglide™ and Tomma™ hardware, which share the same pattern. At that rating the door is a heavy glass or timber leaf, and the carriage is what gives out — the wheel flat-spots or the bearing seizes under load, the door starts to judder, and the anti-bounce guide is what stops it lifting off the track as it does. The critical check is how the carriage mounts. One of these is top-fix, fastening up into the door, and the other is not, so take the old one out and look at the fixing before ordering. Confirm the 100kg rating suits your leaf as well.