Metal cutting shears. By Rock & Fix. 14:30 video:
https://www.youtube.com/watch?v=QrTWE0wVggk
Previously:
36 Best Homemade Metal Benders eBook
https://www.homemadetools.net/forum/...811#post179067
https://www.homemadetools.net/forum/...772#post167382
https://www.homemadetools.net/forum/...304#post165745
https://www.homemadetools.net/forum/...546#post158881
https://www.homemadetools.net/forum/...379#post150756