The Mini-Clamp is perfect for PAR 38’s, Pin Spots, and other small fixtures. The clamp is made from an aircraft grade aluminum extrusion with micro-grooves that conform to the pipe for real gripping power. The Mini-Clamp will grip from 3/4” to 2” tubing. Pipe bolt is 3/8”-16 TPI x 2” Black Plastic Knob. Yoke bolt is a 3/8”-16 TPI x 3/4” long. SWL is 150 pounds,70kg, yet the Mini-Clamp weighs less than 6 Oz.!