Trellis Hardware by Hayn Lines
www.hayn.com/cables/systems/trellis_system_hardware.html
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Trellis System hardware made from 316 grade stainless steel is offered in 1/8" – 1/4" wire diameters. The system is designed to accommodate cables attaching perpendicular to each other to form a grid pattern. Cable sizes greater than 1/8" utilize the LP104 series posts which have an additional support base for stability. The posts offer a through mounting system for attachment to a surface.