5pcs 0.4mm 3D Printer Drill Bit Nozzle Cleaning Tool Kit

How to choose: You can choose a drill bit that is same size or one size down your nozzle, for example, if you had a 0.3mm nozzle to clean, you can buy a 0.3mm or 0.2mm drill. Size to choose: 0.15mm cleaning needle: total Length 50mm/1.97',Bit Diameter*Bit Length 0.15*25mm/0.006'*0.98'; 0.2mm cleaning needle: total Length 50mm/1.97',Bit Diameter*Bit Length 0.2*25mm/0.008'*0.98'; 0.25mm cleaning needle: total Length 50mm/1.97',Bit Diameter*Bit Length 0.25*25mm/0.01'*0.98'; 0.3mm cleaning needle: total Length 70mm/2.76',Bit Diameter*Bit Length 0.3*40mm/0.012'*1.57'; 0.35mm cleaning needle: total Length 90mm/3.54',Bit Diameter*Bit Length 0.35*60mm/0.014'*2.36'; 0.4mm cleaning needle: total Length 85mm/3.35',Bit Diameter*Bit Length 0.4*50mm/0.016'*1.97'.