Most soldering irons for electronics have interchangeable tips, also known as bits, that vary in size and shape for different types of work.Pyramid tips with a triangular flat face and chisel tips with a wide flat face are useful for soldering sheet metal.Fine conical or tapered chisel tips are typically used for electronics work.Tips may be straight or have a bend. Concave or wicking tips with a chisel face with a concave well in the flat face to hold a small amount of solder are available.