Carbon steel hardened and tempered for longevity Pivoting adjustable working head for easy tightening and removing faucet and fill valve nuts Spring loaded jaws for auto adjusts to the size of nuts 11" Long reach shaft for getting the nuts in hard to reach places T rod handle for easy turning and operation his HAUTMEC basin wrench can work on different nuts (like faucet nut or sink nut etc) with diameter form 3/8inch to 1-1/4inch. The high quality, long-reach, pivoting head, spring loaded jaws allow to work as faucet wrench tool or under sink wrench, it is a great tool of plumbing wrench for plumbers and house-hold.