The Manfrotto 237HD Heavy Duty Flexible Arm is used to allow accurate positioning of small lights and accessories. Normally used in conjunction with light stands or clamps, the 237 HD flexible arm is 55cm long, has a diameter of 18mm, and features a hexagon stud to fit the Manfrotto 035 Super Clamp with 3/8" female thread and 16mm stud with 1/4" male thread type.