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, PTFESize: M6*40mm, M6*50mm(Optional)Thread OD: 6mmThread ID: 4mm(one end), 2mm(the other end)PTFE Tube Length: 20mmPTFE Tube OD: 4mmPTFE Tube ID: 2mmSuitable For: 1.75mm filamentQuantity: 5pcsPackage Includes:5pcs x Nozzle Throats1M6 screw part is made of high quality stainless steel, durable and long service life2There is a PTFE tube inside which ensures fluent passing through of filament3Comes total 5 pieces in one pack and you may use them for quite a long time4Widely used and fit for any 3D printer extruder that uses 1.75mm filament5Great parts to built a 3D printer or used as a replacement for old or broken part