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Extruder Nozzle Cleaners are an essential item for any 3D printer owner. Every extruder nozzle must be cleaned out from time to time. These micro dtill bits are the perfect tool for the job. By using these precision drill bits, you will extend the life of your nozzle and without a doubt, produce finer prints. Specifications: Bit diameter: 0.4mm The bit length: 16mm The length of shank: 20mm Please kindly note: Don't use the drill to clean until the nozzle is heated to above 200 degrees! Package Included: 10 x 0.4mm Drill Bits