This Drill bit is for cleaning of the nozzle, before use it, first please make sure your nozzle is heated to the temperature of printing the filament you was used, for example, if you were use ABS filament, please heat the nozzle to 200-220ºCelsius, PLA  is about 180-200ºCelsius
Cleaning Needle Size:
① 0.2mm 10pcs
② 0.25mm 10pcs
③ 0.3mm 10pcs
④ 0.35mm 10pcs
⑤ 0.4mm 10pcs
⑥ MIX 10PCS (0.2*2pcs, 0.25*2pcs, 0.3*2pcs, 0.35*2pcs, 0.4*2pcs)
Features:Lengthened, apply with new technology, not easy to break, bendable, new products promotion