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This is a 22.5 degree elbow. This part, like my other modular lightsaber parts, is sized to accept a small flashlight inside like the one found here: https://www.harborfreight.com/3-12-in-Mini-Flashlight-69111.html Though the flashlight will not fit all the way through the elbow, it can enter it somewhat from either end.
This part allows for bends and angles in your lightsaber. This enables the builder to create unique pieces to match their own style.