If lower、 please purchase upper cable、 and if upper、 please buy lower cable; This cable is used to add a 2nd internal hard drive into your Apple MINI MAC; Produced before Mar. 2013、 the lower cable is against the antenna-gate in your MINI MAC and shown as the Lower in your system; Produced after Mar. 2013、 your system will display Upper. Dimensions: 3.54 in x 0.59 in x 0.59 in (9.0 cm x 1.5 cm x 1.5 cm) Weight: 0.78 oz (22 g)