a Holds tools and equipment from 1 3/4" to 2 7/8" (44 to 73mm) in diameter. a Each clamp supports a safe working load of 50lbs, with a break- strength of 150 lbs. a Mounts with two 1/4" bolts or screws. a Mounting area: 1" X 3.5" (25 x 89 mm)