Description: 3D printer extruder hot end requires heat sink to operate properly - metal base, aluminum block, or any other type of cooling device. This set includes a 30mm long stainless updated tube for low friction, trouble free print, and n ozzle can be exchanged or replaced with many different types of nozzles. There are also heating tube, aluminum heating block and t hermistor of good quality. It would be a great replacement for old extruder. Features: Stainless steel updated throat tube for trouble free, low friction print, much solid quality. Pre-wired white color thermistor is connected to the updated heater block. 12V version with 40W red heat tube. Use it with heat sink or cooled metal base to enhance heat dissipation. Plenty of nozzles compatible with this hot end which means nozzle replacement is easy. Comes fully assembled and you can replace your old 3D printer extruder parts directly. Specifications: Type: MK8 Material: Aluminum, stainless steel and brass Installation: External thread connection Nozzle Size: 0.4mm Throat Length: 30mm Aluminum Block Size: 20mm x 20mm x 10mm Cable Length: 103.5cm / 40.7" Working Temperature: -40~+ 260°C（-40~+ 500°F） Package Includes: 1 x 1.75 mm to 0.4 mm MK8 Nozzle 1 x Heating Block 1 x White Thermistor 1 x 12V40W Red Heating Tube 1 x M6 x 30mm Throat Tube Note: 1. Please allow 1-2mm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. .