a Two 14'' (356mm) separate straps hold round objects up to 15" (381mm) in diameter. a Holds equipment measuring up to 28" (711mm) in linear distance. a Each clamp supports a safe working load of 150lbs. (68 kilos) with a break-strength of 300lbs. (176 kilos). a Two clamps support 300lbs with a break-strength of 600lbs (272 kilos). a Each half of the clamp mounts with four #10 screws or bolts. a Mounting Area: 2" x 2" (51mm x 51mm)