Set of 3 small suspension spring for German-made Hermle chain-wound and spring-wound mechanisms movements in modern day mantel, and wall clocks. movements series 131, 141, 151, 241, 261, 341, 351, 352, 451, 1051, 1151.030 The size is 8.0 mm. wide x 17.0 mm. in length. Please call or email if you have any question or need another size .