Thermocouple Head: 1. Material: Alloy-Aluminum 2. Protection Tube Entry: NPT1/2, M20*1.5, other entries on request Thermocouple Head: Material: Alloy-Aluminum, KNE Weight 274g.Protection Tube Entry:PF1/2", PF3/4", NPT1/2", NPT3/4", BSP1/2", BSP3/4", M20X1.5Extension Wire Entry:PF1/2", PF3/4", NPT1/2", NPT3/4", BSP1/2", BSP3/4", M20X1.5 Thermocouple Heads (KNE)