This Pro Swivel Dual Clamp from Odyssey Innovative Designs is compatible with any tube with a diameter between 1.5 and 2", and works great with speedrail. Thanks to its swivel action, this tool is ideal for connecting truss pipes or any posts running at angles to one another, and can support roughly 1000 lbs. Wing nuts are provided for making adjustments without needing tools on set, saving you time. And as we all know, time is money.