Do you hunt for artifacts, if so you are going to want one of these made for underwater use, Nut Buster Hammer and Chisel? The Manta Nut Buster is an all stainless steel hammer with a convenient screw-in chisel. The screw-in chisel, stores inside the hammer handle and is made of high quality cold steel. The Manta Nut Buster weighs a solid 5 lbs (2.27 kg). (To be used for legal salvage only). Made in the USA and comes with a 60 month limited warranty.