Better than a pipe wrenchIf you are not equipped with wrenches that fit the nuts on your stuffing box, we suggest you purchase TWO of these. Why Because you will need two to make an adjustment: One for the locking nut and one for the adjusting nut. These wrenches tend to be easier to use than pipe wrenches especially in tight engine spaces where many boaters must work. Primary Usage: Adjust/remove inboard shaft packing nut Material: Cast chrome plated steel Size: 1" to 3" adjustable Warranty: Limited Lifetime