This Impact BHE-102 Heavy-Duty Flex Arm for Super Clamp is ideal for supporting small lights, reflectors or other items up to 1.1 lb . Made of flexible aluminum, the 18 mm diameter arm measures 21.65" long and can be twisted into configurations that would be impossible with a jointed articulating arm. One end of the arm has a 3/8" female tapped hex stud to prevent torsion in the Super Clamp. The other end terminates in a 1/4"-20 screw on a 5/8" stud.