Markyyys

I found a picture. It's not quite right, but you can see the spar slots into something Basically, I want to know how to fix the spar to the sail, without using just tape or glue which is going to break. There must be something like in the picture that I can buy, that can be securely fixed to the sail, but the spar can be slipped in and out of. I hope anyway!

Sorry for the n00b question all. I'm looking to make my own kite, and I'd rather not use glue and tape to keep it together. On manufactured kites I've seen, the spars slot into a specific hole / socket / sheath on either side of the sail. What is the name of this, so I know what to look for when ordering parts? I've found the names for all of the other bits, just not that one! Thanks