Poacher's Saw

The Poacher's Saw is an item that is part of the trading sequence in Ocarina of Time. You get the poacher's saw from Grog in the Lost Woods and if you take it to a carpenter in Gerudo Valley he will give you a broken Biggoron's Sword which you can later fix to get a sword two times stronger then the Master Sword. You can only do this as an adult.