MK7 MK8 All Metal Remote Extruder Kit For 1.75mm Filament 3D PrinterFeature:Suitable tetrafluoroethylene tube 4mmUse 1.75 mm Supplies7075 aerospace quality aluminum alloy surface sandblasting oxidation.Type: Left hand, Middle, Right handEquipped with two pneumatic fittings, the feed process more smoothly, you can make your extruder closer to the print head (reducing brushed remote feeding problems arising from this can to some extent), while the supplies can be placed in a more appropriate position, and not worry about other issues stuck supplies)Package included:1 x 42 stepper motor with cable1 x 42 stepper motor holder1 x MK7 extrusion gear1 x 624 ZZ pillow2 x Delivery head1 x Hexagon wrench1 x Adjusting springs set1 x Assembly srews set