A three-prong clamp is a lab tool used to hold and secure various types of lab equipment, such as burettes or test tubes. This particular three-prong clamp is rotatable, allowing for easy adjustment of the angle of the equipment.

It has a sturdy construction, made of metal or aluminum, and can be easily attached to a laboratory stand or support. The clamp also features rubber grips on each of the prongs to ensure a firm hold without damaging the equipment. It is commonly used in chemistry and physics labs.