Smooth knurled bracelet. You can choose between single or double knurled template. You have to enlarge the template to get the right size! The template has a inner diameter of 1mm, so factor 67 give you a bracelet with a inner diameter of 67mm. This should also work for inch.Please use the scale function of you printer software. Enlarge it by 68 to get a bracelet of 68mm. This should also work for inch.