Features 1,M6 screw part is made of stainless steel, durable and long service life 2,There is a PTFE tube inside which ensures fluent passing through of filament 3,Comes total 5 pieces in one pack and you may use them for quite a long time 4,Widely used and fit for any 3D printer extruder that uses 1.75mm filament 5,Great parts to built a 3D printer or used as a replacement for old or broken part Specification Features: M6 screw part is made of 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: M6x40mm, M6x50mm(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 Package List Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.