A piercing saw, also known as a jeweler's saw, is a type of saw commonly used in jewelry making on sheet metal. It is usually used on softer metals as the saw is delicate. Like a coping saw, a piercing saw holds the blade in tension in a metal frame. As the fine blades frequently break, the frame is adjustable for blade length to allow the re-use of broken pieces. The frame throat size can range from 50 to 200 mm (2.0 to 7.9 in).