Roughing Gouges are only used on spindle work. They are designed to take of the corners of square stock making the stock round to a true cylinder. They will also make initial shaping cuts removing the bulk of waste wood very quickly and efficiently. Roughing gouges have a shallow curve and long cutting edge by rotating the tool you can use all of the cutting edge, after all you bought all of the tool! However, do not use the extreme corners as they will catch in the wood.