It appears that the way to make it fit three different sizes of truss pipe is to swap out the inserts. It comes with two sizes of inserts. Large inserts and it will fit 2" pipe. Small inserts and it will fit 1" pipe. One of each and you'll get it to fit the 1.5" pipe.The build quality looks pretty good. The specs say that they'll hold 76 pounds, but I'd be afraid that the pin in the clamp side might pull out/crack at that weight.Always use a secondary safety cable around your light and the truss in case the clamp fails!

Same quality as the "name brand" makes that continue to rise in price every time you buy them. Same heavy, durable plastic you have come to know & love...only cheaper priced!

Superb product at very reasonable price , well made .

The clamps work great. easy to reposition equipment on the bar in a fly

For the price these work very well. I only used them for light weight 2-5lb lights so not sure about heavy weight lights. But for the LED fixtures I use they work great.