... , WZr8, WL10, WL15, WL20 2. Diameter:1.0 - 12.0mm 3. 150, 175mm Tungsten electrode 1. Item: WP, WT10, WT20, WT30, WT40, WC20, WZr3 ... Quality of surface: ground finish. DESIGNATI COLOR SIGH CONTENT % IMPURITY % TUNGSTEN % LENGTH (mm) DIA. (mm) WT10 YELLOW 0.9-1.2 ... , 175, 178 0.5-10.0 WT40 ORANGE 3.8-4.2 ≤0.2 MARGIN 75, 150, 175, 178 0.5 ... , 178 0.5-10.0 WZ3 BROWN 0.2-0.4 ≤0.2 MARGIN 75, 150, 175, 178 0.5- ...