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This file includes two chain holders, typically seen on semi truck tractors to hold the chains necessary for winter travel of course! This file includes a pair of 24" and 18" long hangers. The design has passed all the checks in three different software programs I use, so I’m confident it will print without issues in the Frosted Ultra Detail material, which is what it should be printed in at minimum for the level of detail on it. I however would strongly encourage it be purchased in the Extreme detail material, as the top of the pieces have a diamond plate texture. Should you have any questions or issues, feel free to contact me via the Shapeways links, or direct via Email to firstname.lastname@example.org