This is a set of 2 copy lights with mounting brackets that mount on to the baseboard of most large copy stands. They come complete with 2 75 watt diffusion bulbs for even light coverage. The lights are easily adjustable. They slide forward or backwards on the extension arm. Also the mounting bracket has an adjustable tilt to allow you to move the lights further away from the baseboard. You can usually mount the main bracket at the rear of the baseboard and move the lights off to the side to allow you to shoot pictures of large artwork or pictures.
These lights are designed to work with the larger copy stands like the 36 inch or 42 inch tall heavy duty stands. They will fit other copy stands, but the base of the stand must have feet on the bottom of the stand that give you at least 3/8 of an inch clearance between the bottom of the baseboard and your work table. The base board can not be more than 1 inch in thickness as that is the maximum spacing on the mounting clamp.