The description says this tool is for rounding the ends of 18ga - 14ga wire, what just not true. These mugs are SMALL! The largest can hold 22 ga, maybe 20 ga. The smallest is almost useless unless you round up 28ga wire. Only purchase this tool if you are rounding 28ga-22ga wire ends and are NOT larger. At the same time, the tool is well made and the size of the collets is suitable for the bars of the millstones.