Precise Design--The 1.75mm Input 0.25mm extruder nozzles can prevent print head from overflow effectively and produce consistent prints with smooth and glossy polish. Reduce the resistance from the corners and avoid blocking of the filament with rounded chamfer. Cleaning Needles---The nozzle cleaning needles are very flexible and robust, easy to bend the needle into the nozzle and will not break. Good for handle tough extruder hot end nozzle clogs. Material---The 3D printer nozzle is made of brass material, sturdy and durable, connect with M6 out the thread, easy to install. Applicability and Compatibility---Fit for external M6 thread connection, for all V5 V6 1.75mm PLA ABS 3D printers. Note---After replacing the nozzle, please check the distance between the nozzle and build plate to ensure the quality of print parts.