Actually those were used primarily for Darth Vader's lightsaber and Luke's in Return of the Jedi. The components of Obi Wan's lightsaber are (from left to right on the image) A British sink drain, the casing of a British rifle grenade, the battery holder clip from a Graflex flash gun, a miscelaneous British lawnmower part, and a British sink handle. Dunno why all the parts are british, but aparently they are.