Size - 3/8" (10 mm) Made with Black Coated Carbon Hardened Steel. Designed with Knurled Grip for Easy Gripping! Safety First - Always wear safety glasses. Intended for Adult use only. Great for Stamping Gold Jewellery, Sterling Silver Jewellery, Watches, Bracelets, Necklaces, Gold Bullion, Gold, Silver Bars, etc. Listing contains 1 Stamp Please visit our store for other great jewellery tooling items such as; Hand Stamps, Disc Cutters, Polishing Compound, Buffers, Hammers, Tweezers, Mandrels, Anvils, Vises and more! Thanks for looking!