Xadnitu Strut Channel, 1-5/8" 12 Gauge Metal Strut Channel with Slotted Back, U-Channels with Pre-Galvanized Metal 4.9FT/1.5M Length - Amazon.com
41*21mm Galvanized Steel Stainless C Type Strut Channel with Elongated Slotted Holes - China Cable, Cable Gland | Made-in-China.com
NEWHOUSE ELECTRIC 1-5/8 in. 4 ft. 12 Gauge Steel Half-slot A Strut Channel, Slotted Back, Electro-Galvanized Metal U-Bracket SC12-4-EG - The Home Depot