Unistrut P1000T-20SS: 1-5/8" x 1-5/8", 12ga Slotted Channel, Type 304 Stainless Steel, 20 Feet
Thomas & Betts - 10' Long x 1-5/8″ Wide x 1-5/8″ High, 12 Gauge, Strip Steel, Half Slot Framing Channel & Strut - 54055017 - MSC Industrial Supply
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