Features: The accessory kit comes with 5 * nozzle extruders + 5 * heater blocks + 5 * throat tubes, enough for use. Used as replacement print head, easy to assemble, reliable accessory for 3D printer DIY lovers. Universal design, suitable for various 3D printers, such as Anet A8/ A6/ Ender 3, etc. External thread diameter of extruder throat is 6mm, input diameter of nozzle and extruder throat is 1.75mm, great compatibility. Made of premium metal material, compact workmanship, great for use and durable. Specifications: Model: Nozzle Extruder + Heater Block + Extruder Throat Set Quantity: 2pcs set / 5pcs set(Optional) --Nozzle Extruder Material: Brass Input Diameter: 1.75mm Output Diameter: 0.4mm External Thread Diameter: 6mm --Heater Block Material: Aluminum Suitable for: 3D Printer Nozzle & Nozzle Throat Hole: M6 Heater Mounting Hole: 6mm diameter Hole for Mounting Screw: M3 Thermocouple Mounting Hole: M3 Dimensions: 2 * 2 * 1cm / 0.8 * 0.8 * 0.4in(L*W*H) --Extruder Throat Material: Stainless Steel Input Diameter: 1.75mm Length: 30mm External Thread Diameter: 6mm Internal Thread Diameter: 4mm Package Size: 8.5 * 7.5 * 2.5cm / 3.3 * 3 * 1in Package Weight: 78g / 2.8oz Package List: 5 * Nozzle Extruder 5 * Heater Block 5 * Extruder Throat