Constructed from solid aluminum die-casting, the Kupo T-12 LED Tube Mounting Clamp is designed for quickly mounting those major brands of T-12 LED Lamp Tube Diameters from 38 to 42mm. Features rubber pads equipped inside the clamp that protects LED Tubes from scratches. The strong steel spring on the jaws keep the LED tube securely and firmly in place. A 1/4”-20 female thread on the bottom and one 3/8”-16 female thread on each side of the clamp allows for connecting the clamp with any grip equipment that comes with a 1/4”-20 or 3/8”-16 male threads. Supports up to 4.4lbs (2kg).