| Element | K | 
        
            | Tolerance | JIS class 1 (grade 0.4), 2 (grade 0.75) | 
        
            | Protective Tube Material | SUS316, SUS310S, SUH446 (Sandvik P4), 253MA | 
        
            | Protective Tube Outer Diameter (Element Diameter)
 | φ10 (φ1.6), φ15 (φ1.6), φ22 (φ3.2) | 
        
            | Protective Tube Length | Up to 2000mm | 
        
            | Tip Type | Closed type | 
        
            | Filling | Highly pure magnesia MgO | 
        
            | Double Elements Protective Tube Outer Diameter (Element Diameter)
 | φ10(φ1.6), φ15(φ1.6), φ22(φ2.3)mm |