?High-Quality Material:Made of high-quality highs strength solid steel ,galvanized material strong and durable,also prevents rust and corrosion.Compatible with Unistrut P1000 P1001 P5000 P5001 P5500 P5501.

?Excellent Performance:Each 6-wheel cart assembly can provide 650 lbs of weight support.Fits 1-5/8 wide and all post channels 1-5/8 or higher,can be used front and rear.Each hole is 0.55 (16mm) in diameter.

?Smooth Operation:Bearing trolley assembly bearings and pins are precision welded for better stability.Deep groove ball bearings ensure smooth operation without any noise when you use it.

?Simple Installation:Easy to install and disassemble, easy to use.Package includes 2 trolley components,Reliable quality for your long-term use.

?Wide Range of Applications:You can use it to install trolley systems like ceiling or gym sandbags, electric lifts, or use it in your DIY projects.