2G (6mm) 0g (8mm) 00g (10mm) 7/16 (11mm) 1/2 inch(12mm) 9/16th (14mm) 5/8th (16mm) 11/16th (18mm) 3/4th (20mm) 7/8th (22mm) 1 inch(25mm) 1 1/8th inch (28mm) 1 1/4th inch (32mm) 1 1/2th inch (38mm)