Description: This item includes a stainless steel screw part and a PTFE sleeve tube. It is a perfect replacement for the broken part on old extruder and is also a usable workaround for cheap replacement extruder that didn't have a PTFE tube. It can be used on any 3D printer extruder that uses 1.75mm filament. Features: M6 screw part is made of high quality stainless steel, durable and long service life. There is a PTFE(Polytetrafluoroethylene) sleeve tube inside which ensures fluent passing through of filament. Comes total 5 pieces in one pack and you can use them for quite a long time. Widely used and fit for any 3D printer extruder that uses 1.75mm filament. Great parts to built a 3D printer or used as a replacement for old or broken part. Specifications: Material: Stainless steel, PTFE Total Length: 30mm Thread: M6 Thread OD: 6mm Thread ID: 4mm(one end), 2mm(the other end) PTFE Tube Length: 20mm PTFE Tube OD: 4mm PTFE Tube ID: 2mm Suitable For: 1.75mm filament Quantity: 5pcs Weight: 15g(approx.) Package Includes: 5pcs x Nozzle Throats Note:1. Please allow 0.1-0.3mm 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.