Feature:1. Crucible Sets: Our 4 piece quartz crucible set includes a stainless steel crucible holder and three different sizes of quartz crucibles (100g, 150g, 250g) to meet your various melting needs, providing you with convenient lab instruments and tools.2. Material: Made of quartz, this crucible dish can withstand temperatures up to 2,800F / 1,537C without worrying about material breakage or distortion, ensuring your safety and stability during melting experiments or processes.3. Practical: The crucible clamp in the set comes with a handle that holds the crucible disc securely in place by reverse clamping, making pouring easier. The tension in the handle ensures that the crucible disc will not accidentally slip out of place during processing.4. Widely Useable: This professional melting quartz crucible cup set is suitable for high temperature melting alloys such as gold, brass, bronze, silver, copper and more, making it ideal for jewellers, metalworkers, blacksmiths and chemical refiners.5. Tips for Use and Care: To enhance the performance and extend the life of your quartz ceramic crucibles, it is recommended that you heat them slowly and apply a borax glaze before use. By following these steps, you will be able to maximise its value and effectiveness.Specification:Item Type: Quartz CrucibleMaterial: Stainless Steel, QuartzSet Includes: Crucible Tongs x 1, Quartz Crucible x 3 (Approx. 100g / 0.22Ib, Approx. 150g / 0.33Ib, Approx. 250g / 0.55Ib)Size: Approx. Quartz Crucible 1: Weight: 250 g / 8.8 oz, Width: 7.5cm / 2.95in, Height: 2.5cm / 0.98inQuartz Crucible 2: Weight: 100 g / 3.5 oz, Width: 5.5cm / 2.17in, Height: 2.2cm / 0.87inQuartz Crucible 3: Weight: 150 g / 5.3 oz, Width: 6.2cm / 2.44in, Height: 1.8cm / 0.71inCrucible Tongs Length: 25cm / 9.8in.Package List:1 x Crucible Tongs3 x Quartz Crucibles