Autocut tools are spring loaded so you won't be able to adjust the size of the cut. [substeps] For example, for a small 1/2 inch (12 mm) pipe, buy a 1/2 inch (12 mm) autocut tool.
[header] How to cut copper pipe [title] Select an autocut tool. [step] If you're cutting copper pipe in a tight space (such as up against a corner), use an autocut tool. Measure the diameter of the pipe you want to cut and purchase an autocut tool for that exact size.