Reply To: What Instruments used to measure Girdle thickness & [W] Width of Stone? › Forums › Tools and Other Hardware › What Instruments used to measure Girdle thickness & [W] Width of Stone? › Reply To: What Instruments used to measure Girdle thickness & [W] Width of Stone? May 7, 2016 at 11:54 am #2618 Joseph JuchaParticipant @josephjucha For more direct measurement of girdle I use the appropriate bit from a pin vise drill set. Since you can mount it in the vise it’s easier to hold still.