Holds objects from 2 3/4" to 3 1/4" (70 to 83mm) in diameter.
Each clamp supports a safe working load of 50lbs (23 kilos).
Mounts easlity with one 1/4" (6mm) bolt or screw.
Mounting area: 4 1/2" x 1 1/4" (113 x 32mm)