Steel Case Gauge 4Z2 1)Dial: 1.5", 2", 2.5", 3", 3.5", 4", 6" 2)Connection size: 1/8" 1/4" 1/2" 3)CE Certificate ... Steel Case Gauge 4Z2are high quality dry gauges design ... .CASE SIZES:1.5", 2", 2.5", 3.5", 4", 4.5", and 6", 8", 10",CASE MATERIAL:Steel case, steel black case, steel chrome plated case ...