Item Descriptions: -[Usage]: Compatible with 1.75mm filament 3D printer, E3D V6 Extruder. -[Heating Block]: Solid aluminum construction, dimension is 20 x 15 x 11.5 mm0.78 x 0.59 x 0.45 Inch. -[Nozzle Throat Tube]: Made of stainless steel and built-in PTFE. Length is 22.5mm0.88 inch. Outer Thread is M6. -[Print Head Nozzle]: Made of brass, hole diameter is 0.4mm0.016inch, well-made, enough to make it work well. -[Thermal Insulation Pad]: Made of heat-resistant ceramic cotton fiber, overallsize is 70x20mm 2.75x0.79inch. -[Package List]: 5x 3D printer extruder assembly kits, each kit including 1 Extruder Nozzle 1 Aluminum Heater Block 1 Extruder Throat Tube 1 Thermal Insulation Pad Package: 5x Extruder Nozzle 5x Aluminum Heater Block 5x Extruder Throat Tube 5x Thermal Insulation Pad Item Specifications: Type:Extruder Assembly Kit Filament Diameter:1.75mm0.07Inch Nozzle Hole Diameter:0.4mm0.02Inch Aluminum Block Size:20x15x11.5mm0.78x0.59x0.45Inch Material:Aluminum&Brass&Stainless Steel