Your axle's wider than the standard clamp can reach. This 50×50mm compression clamp gives you that extra span while still gripping an 18mm square stem dead tight. You mount your roller, tighten the clamp, and it stays put. No play, no re-tightening after every launch. If your hull config needs a broader mounting footprint, this is the one
| brand | Jaycar |
| model | MTR050 |
| clamp_size | 50×50mm |
| stem_size | 18mm square |
| application | Boat roller axle mounting |
| category | Marine Hardware |
