Another quality product from Park Tool. Very strong with just the right weight to punch axles through bottom brackets. The nylon end (I think it's nylon) seems too heavy to use without damaging the finish, but I bravely tried it on my (old) Gossamer Hollowtech crankset and found it holds the finish very well. I'm sure the hardness makes it more durable which is good and it's replaceable. The rubberized grip is also comfortable and secure.