Burette Clamp Double fisher style. Our 1019003 burette clamp is built with quality and strength in mind. Built with durable long lasting metal body construction, and using high quality components for the claws, including soft rubber grips to hold your delicate burettes! This type of burette clamp has very simple operation, by pinching the outer arms together with the provided levers this will open the clamp. Place your burette between the now open rubber arms and then gently release the outer arms till the burette is firmly pinched and held in place.