TIG Ceramic Size 5 10N49 for WP17 - Collet Body Binzel
TIG ceramic item 10N49 - WP17 the most common ceramic for the general use WP26 collet body setup - Genuine Binzel this is size 5 = 5 x 1/16" = 5/16" 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