Features: All-metal heat break works well with high-temp filaments, high-temperature resistant. Made of quality material, strict inner polishing process, the filaments maintain minimum friction resistances. It can slow heat conduction, smoother flow of filaments, greater tensile torques strength, higher heat-dissipation performances. The heatbreak is used for 1.75mm filaments. This throat nozzle can be direct replacement for Red Lizard V5 Pro K1 printer. Specifications: Material: Metal Size: Mixed Size Applicable Model: Suitable for Red Lizard V5 Pro K1 3D Printer Extruder Hotend Inner Hole Roughness: less than Ra0.3 Filaments: for 1.75mm Filaments Package Includes: 1x Extruder Hot End Replacement Throat note: Please allow 0-1cm error due to manual measurement. Please allow for slight color difference due to different display resolution.