Capable of clamping to piping 1 ¼” to 1 ½” in diameter, the Matthews baby grid/pipe clamp can be used with overhead railing or other rigging systems to creatively mount lighting or other objects with a ⅝” baby pin. You can use it two ways: clamp a pipe or speedrail in order to hold a light, or put the pin in a grip head to hold speed rail.