Cliff and I were chatting last evening and he asked what was the largest bolt the thing will cut? It looks like 5/16-18. It is meant to only cut soft bolts, probably why they stopped making them. People no doubt abused them and tried cutting hardened bolts. But for screws? Perfect. All of what I consider to be the “most common” standard, non-metric, screw diameter and threads. Here is a picture that shows the sizes.