Single adjustment clamp with shaft wing nut to allow clamp jaw movement through 360°. Rod holder grips up to 3/4” (19mm) diameter. The medium clamp has a 1 1/2” (38mm) maximum grip size with a 1/2” (13mm) O.D. extension arm. The large clamp has a 2 1/2” (64mm) maximum grip size with a 5/8” (16mm) O.D. extension arm. Complete with removable vinyl and fiberglass covers for easy cleaning.