Package Included 5pcs Quartz Silica Melting Crucible (100g/150g/250g/500g/1000g) and 1 pcs Heavy Duty Stainless Steel 7.87 inch Crucible TongsOur ceramic crucibles are made of 99% pure quartz with high thermal conductivity, chemical resistance and high temperature resistance up to 2800 degrees FahrenheitCrucible tong is made of stainless steel for durability. The length of 20 cm/7.87 inches allows you to use it at a safe distance from the crucible without burning your hands. Please note that it can only hold round bowlsSuitable for refining casting molding of /metal/gold/silver/brass/copper/alloys. Its tapered sides and pouring spout are designed for easy removal of materialThe crucible set is an ideal melting casting refining tool for jewelers, goldsmiths, blacksmiths, chemical refiners. Slowly heat the quartz ceramic crucible before use and make sure to coat the crucible bowl with borax before useSpecificationSize: (.) (OD x ID x Deepth)5.8x4.5x2.1 cm/2.28x1.77x0.83 inches (100g)6x5.2x2.2 cm/2.23x2.05x0.87 inches (150g)6.8x5.8x2.5 cm/2.68x2.28x0.98 inches (250g)8.8x7.5x3.8 cm/3.46x2.95x1.49 inches (500g)10.2x9x4.3 cm/4.01x3.54x1.69 inches (1000g)Crucible Material: QuartzCrucible tongs Material: Stainless steelSize: (.) (L) 20 cm / 7.87 inchesClamp closing width: (.) 6.5 cm / 2.56 inchesMaximum width of clamp: (.) 16.5 cm / 6.5 inchesColor: As ShownMaterial:ceramic+metalPackage Contents:1 set * crucibleOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.