Forca RTGS-474 Jewelry Hallmark Karat Marking Pliers with 3 Stamps - 5.0&rdquo;~ 125mm. Apply hallmark karat markings to your precious metal items with little effort and much convenience. Stamps are 2.3mm leght and 1.2mm width. These pliers can be used on curved or flat surfaces to stamp inside rings as small as size 4. There is no need for a hammer or a "safe" working surface.  Furnished with three Hallmark Karat Stamps (585=14k, 750=18k & 925). You can hallmark any jewelry piece of 14k and 18k Gold or Sterling Silver.  This set includes a hex key and anvils (one flat and one curved, for rings and other curved items) hold your piece securely while a gentle squeeze of the pliers handles makes the impression. These pliers are made of Polished German Hardened Stainless Steel. Equipped with a spring tension which provides light return pressure to handle. This feature will make your hands do a little less work and help avoid hand fatigue. Manufactured by master craftsman technicians to last forever.  Overall size: 5.0- 125 mm.  Weight: 11.25oz. ~ 327g.  Made in (varies from countries) : Germany, Austria. These pliers are Lifetime Guaranteed.