a Holds objects from 2.5" to 9.5" (64 to 240mm) in diameter. a Each clamp supports a safe working load of 50lbs (23 kilos). a 2 clamps support 100lbs (45 kilos). a Mounts with three #10 bolts or screws. a Mounting area: 6" x 7/8" (152 x 22mm).