Features: 100% brand new and high quality The corresponding model of the ruby nozzle is MK8. The body of the nozzle is brass, the gemstone is artificial gemstone. A torque wrench is required during the installation of the nozzle. The nozzle is subjected to a maximum torque of 5 Nm Exceeding this torque will damage the brass inlay. Don't use too much force during the installation process, please try to control your strength. The extruder nozzles are through long-term testing to solve the problem of plugging and missing materials to the greatest extent, low thermal conductivity, resistant to corrosion, high abrasion resistance. When disassembling, heat the nozzle to above 200 before disassembling We still maintain the world's top workmanship, each ruby nozzle will go through a lot of processes in the manufacturing process, I hope that our rigorous attitude can be recognized by customers. Package Includes: 1PC X Ruby Nozzle 0.4mm Specifications: Name: MK8 Ruby Nozzle Nozzle size: 0.4mm Nozzle Body: Brass Maximum torque: 5nM Synthetic gem parameters: (The following are only gem parameters) Material main chemical composition: aluminum oxide (AL2O3). Main physical and chemical properties: Appearance: red crystal, no special odor Purity: > 99.9% Density: 3.9--4. 10g/cm3 Melting point: 2050C soil 50C4 Hardness: Mohs 9 Tensile strength: 0.18Gpa, Compressive strength: 1.9Gpa Coefficient of friction: 0.1 (dry coefficient of friction with steel). Corrosive acid resistance: acid and alkali resistance under normal temperature conditions, not resistant to hydrofluoric acid at 300C. note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.