The spring Nut is the key to the Strut System. There are Long Spring ,Short Spring and Without Spring styles, made with Steel or Stainless Steel 304 and 316. The surface treatment have zinc plated, HDG, Darcormit.
The Normal Long Spring 38-39mm Length. The Normal Short Spring 17-18mm Length.
Insert spring Nut anywhere along the length of the channel and attach the fitting to combine another channel a 90°turn.Easy to use, save time and work.