You are bidding for the vintage  x2 gang Air Capacitor 550  / 550 pF Steel Aluminum Tuning HAM crystal radio ... used ... capacitance of each section is about  550  / 550 pF ... good quality ... steel body and aluminum plates ... body measures 90 x 83 x 76 mm, weight about 0.5 kg ... brass shaft, D = 7.0 mm  ... all numbers are approximative ... actual photos are part of description