Sawtooth Arrows are a type of arrow and tool used for the Bow available at Garrett's disposal in Thief.
They are a more lethal version of Broadhead Arrows. They cost 50G each and become available after chapter 4. Due to the cost and low carry limit they should be used sparingly, but they are very useful and powerful. They have armour-piercing capabilities and can one-shot kill most enemies, even while alerted.