Hair straighteners measure a standard length of about 45 cm. When we talk of the plate, there are no adjustable plates. However, we have interchangeable plates. To elaborate further, you have to detach the head of a hair straightener that features a specific plate size and replace it with another. When it comes to the place sizes, we have the ½-inch to 1-inch plate sizes suitable for individuals with short hair and the 1-inch to 2-inch plate sizes for individuals with long hair.