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This Quad Engine Mount converts the Semroc SLS Laser-X rocket (sold separately) into a quad 18 mm standard engine powered rocket. Simply assemble, insert into the SLS Laser-X, and twist into place. This kit contains four engine mount tubes for .690" (18mm) x 2.75" (70 mm) engines, two centering rings for Series #225 body tubes, thrust rings, adapter tube, coolant fins, and engine hooks with full instructions.