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Sonostar 6-Star hubs are designed to be used with 1/2" Schedule 40 PVC tubing.
Solid core hubs.
The hubs are made of high-strength white PVC, with pre-molded holes for bolt fasteners placed 1/2" from the end of each arm.
There is a 10-degree curvature molded into each arm from the hub center, which gives the hubs an 'inside' and an 'outside' when putting the dome together.
Steel nuts and bolts are included.