These nozzles are to make 1.75mm or 3mm, ABS, PLA or other types of filament. We also offer a pre-drilled nozzle for users who are looking to make custom size extruder nozzles. Pre-drilled nozzles have a 1mm hole. Please note that the nozzle size will be a different size than the filament that is being made. It is best to pull down the filament to the correct size.