Apollo's aluminum Get-A-Grip C-clamps are a strong and durable solution for hanging all of your lighting fixtures. The unique design of this extruded aluminum c-clamp provides incredible muscle and the interior serrated edge effortlessly grips the pipe, providing a strong and reliable hold. The clamp has roll form threads that provide additional durability and allow smooth backing in and out of the yoke. The Get-A-Grip C-clamp design allows for a safe vertical working load (SVWL) of 600 pounds. The adjustable mounting bolt allows for hanging on pipe sizes from 3/4 inch to 1 1/2 inch.