The old C clamp or pipe clamp is designed for most hanging applications. Intended for use with 1-1/2" to 2" O.D. iron pipes in theaters. 2-1/2” long steel shaft with 1/2"-13 yoke bolt and washer. A square head pan set screw allows you to rotate the fixture. Comes in black powder coat finish. 

Note: When using c-clamps care must be taken to not over-tighten the pipe bolt which affixes the clamp to the batten. If this bolt is over-tightened, it can easily dimple or “drill” into the batten, seriously compromising the strength of the batten. A finger tight plus half turn with the wrench is all that is required.