18K Straight Square Shank Hallmark Stamp 1/25" (1.00mm) Impression Height

This straight square shank 18K hallmark stamp is made of precision cut heat-treated tool steel and is used for marking gold alloys that contain no less than 75% pure gold by weight. Straight hallmark stamps are used for making flat surfaces.  If you wish to mark the inside of rings, use a bent stamp. Made in the USA. Leaves a sunken impressions. Measurement refers to the height of the impression, not the width.