Surgical knives, also known as lancets, are sharp instruments used in medical procedures. They are typically made of stainless steel and have a pointed or curved blade. They are used to make incisions in the skin or to cut through tissue during surgery. They can also be used to take samples of tissue for biopsies or to remove foreign objects from the body. Lancets are an essential tool in the operating room and are used by surgeons and other medical professionals.