Specifcation:Item Type: 3D Printer PartAluminium Heater Block: Material: AluminiumNet Weight: Approx. 6 g / 0.21 ozFixing Screw Inner Hole: M3, M6Heating Tube Inner Hole: Approx. 6mm / 0.24inThermocouple Inner Hole: Approx. 3mm / 0.12inApplication: For 3D printer extruder, for CR10, for CR10S, for CR10 S5, for Ender 3, for Ender 3 Pro, for Ender 5, for Ender 5 Pro, for CR10S Pro V2, etc. Silicone Sock: Material: Flame retardant insulating silicone. Features: Use flame retardant materials with good insulation to keep the heating block and nozzle clean. Package List:3 x Aluminium Heater Block3 x Stainless Steel Throat3 x Silicone SockNote:3 sets includes 3pcs aluminium heater block, 3pcs stainless steel throat and 3pcs silicone sock.