... , 230, 240 power:20- 150 inner diameter:3 to 8 thermocouple available:type K voltage:30 , 70, 110, 220, 230, 240power ... :3 to 8thermocouple available:type K and J (outer diamete small than 4).The single end heating bars are mainly bars ... tobacco ,shoe making ,medicine ,rubber ,petrochemical ,glass ,and food industries . Small diameter high and medium power density heaters