This is a seriously clever idea because they'll adapt to almost anything which fits inside the opening: damaged hex or bi-hex heads, square nuts, wing nuts. Pretty much anything as long as it isn't perfectly round and slippery.

• Turn or hold heavily damaged heads & fasteners.

• Turn or hold irregular shapes like square or wing nuts.

• Note Hex pin and Square pin designs.

• Some have a large centre pin.

• Always wear eye protection.

• Consider impact protection.