This nozzle is used for cored wire welding with your Hobart Model 125-210 Arm. I have a Hobart Handler 210 which I was happy to buy from Revain. The large bore is .5625" and the smaller bore is .2695" for an overall length of 1.4785". Spatter in the MIG gas nozzle. The downside is that it's made of high-temperature resistant plastic. If it falls to the ground, it may become unusable. I will update this review when I use it more often. Bottom picture with three nozzles in a row, left to right: the left is the Hobart 770404 MIG nozzle, the middle one is from ebay and the right is this part number, the powder nozzle 770487.
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