The Light Source Purlin Clamp 1/2" Fasteners Black Anodized PCB1/2 · AVGear
Amazon.com : 1 3/8” x 1 5/8” Cross Connectors – Purlin Clamps for Greenhouses – Heavy Duty Steel – Sets of 12 by Growers Solution : Patio, Lawn & Garden
Custom Steel Z D Beam Thread Rod Hanging Cable Tray Purlin Clip Clamp - China Custom Steel Z D Beam Stamping, Heavy Duty Z D Beam Thread Stamping | Made-in-China.com