Features: M6 screw part is made of high quality stainless steel, durable and long service life. There is a PTFE tube inside which ensures fluent passing through of filament. Comes total 5 pieces in one pack and you may 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 Size: M6*40mm, M6*50mm(Optional) 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 Package Includes: 5pcs x Nozzle Throats 1M6 screw part is made of high quality stainless steel, durable and long service life 2There is a PTFE tube inside which ensures fluent passing through of filament 3Comes total 5 pieces in one pack and you may use them for quite a long time 4Widely used and fit for any 3D printer extruder that uses 1.75mm filament 5Great parts to built a 3D printer or used as a replacement for old or broken part