Then use:
If your request for a "deep piece" refers to the technology itself, here is how 7-Zip achieves its famously high compression ratios: 7zipmac
If you search for "7-Zip" on a Mac, you won't find an official GUI application from the original developer (Igor Pavlov) in the App Store. The official 7-Zip is strictly a Windows application. Then use: If your request for a "deep