This is a new drill bit for the model 72 fuel jet. A lot of the jets have the hole plugged and sometimes it's hard to get them clean. This is a black oxide HSS bit for clearing out the hole. Brand new and the same size as the original hole. Works like a charm! Please note, this is a very small drill bit, handle with care. I normally just spin them with my fingers and that does the trick very well. Need a whole new jet? We have those in our store as well.