TDT Torrent Ti Direct Thread adapter is for suppressors threaded 1.375x24 TPI. Perfect for the Torrent X Series line. This is ideal for Form 1 builders or people looking for a strong"" lightweight direct thread solution for popular brand models. TDT Stainless Direct Thread Mount to compliment the X Series line and enable customers to have a simple affordable mounting option. Because Torrent wants to promote modularity and provide alternative mounting solutions for customers using existing industry-leading sound suppressor technology"" these modular sound suppressors are designed to take industry-standard 1.375-24 TPI suppressor mounting options.