For use with internally threaded jewellery - QTBs & QMTBs. Size: 1.2mm x 25mm/30mm Size: 1.6mm x 30mm/40mm 1.2mm Pin for use with 1.2mm Guide Jewellery (0.9mm thread) 1.6mm Pin for use with 1.6mm Guide Jewellery (1.2mm thread)
Gauge Size
The gauge size is the circumference of the smaller bar in the middle.