Round, hub & spoke connectors sometimes called tinkertoy fittings. Most often used in faceted and geometric kite designs, but many hobby uses. Precision machined and very durable. Made in Netherlands, these are much higher quality than other similar hub and spokes, don't be fooled. That means these cost more. We do not recommend altering them unless you know what you're doing, so we offer several sizes. If even more spokes are required for your design, consider 'stacking' them.