This is a universal 3D printer Hot End Nozzle with a diameter of 0.4mm designed to be used with a 1.75mm PLA, ABS, Flex and Nylon filaments. Can be threaded onto your extruder to replace a defective, damaged or a blocked nozzle. It is suitable for printing the widest range of print materials with excellent print results, allowing for soft flexible materials and higher temperature filaments such as polycarbonate and Nylons. It has a M6 thread which fits most Hot End aluminum Heat blocks available. A nozzle with smaller diameter will give better accurate prints compared to a nozzle with bigger diameter. Whereas a nozzle with bigger diamiater will give faster print times. We carry wide range of nozzles diameters and you may chose a nozzle according to your print needs. These nozzles keep getting clogged with use and we suggest you to buy a few more than required and stock up on them if you print regularly. The nozzle screws onto your extruder and is quite straight forward and simple to replace it.