TIG Ceramic Size 4 10N50 for WP26 - Collet Body Binzel
TIG ceramic item 10N50 - WP26 the most common ceramic for the general use WP26 collet body setup - Genuine Binzel this is size 4 = 4 x 1/16" = 1/4" outlet
Sizes as such are as follows;
Size 4 - 10N50 - 6.4mm
Size 5 - 10N49 - 8.0mm
Size 6 - 10N48 - 9.6mm
Size 7 - 10N47 - 11.2mm
Size 8 - 10N46 - 12.8mm