Features: 100% Brand New. The throat upper thread is M6, under thread is M7. Small Inner diameter: 2mm for 1.75mm filament, 3.2mm for 3mm filament Material: Stainless Steel. We have Five Models (1.75mm, 1.75mm with Teflon, 3mm, 3mm with Teflon, 4.1mm Optimized version) you can choose. Size: 22*7mm/0.87"*0.28". Outer diameter: 5.8mm/0.23". Package list: 1 x V6 Heat Throat Brand Unbranded MPN Does Not Apply Material Stainless Steel Outer diameter 5.8mm/0.23" Size 22*7mm/0.87"*0.28" Type V6 Heat Throat UPC Does not apply .