Extruder Brass Nozzle Print Head: Brass Metal Alloy, 45Chamfer design, much easier for feeding with smooth mating face, effectively prevent the hot filament leakage. Nozzle Teflon- Throat Tube: Length 30mm; Filament Diameter 1.75mm; High temperature resistance, prevent heat uploading, to avoid feed expansion in advance to solve the plug problem. Cleaning Drill Bits: Diameter 0.4mm; length 8mm; calf length 20mm; to help you solve the nozzle printhead plugging problem. Compatibility: Extruder Accessories can be used on CNC machines, micro-milling machines or drilling machines or hand tools, It may also function as a Flashforge nozzle, a CTC nozzle. Package Contents:6x Nozzle Print Heads + 6x 3D Printer Teflon- Nozzle Throat Tube + 2x Cleaning Drill Bits. 6x Throat 6x Brass Nozzle 2x Clean UP Drill Bits Material:Brass Throat:Approx.30mm/1.18inches Clean UP Drill Bits:Approx.0.4mm/0.15inches Brass Nozzle:MK8 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.