what do the 2 halfs of the key do when u have both

[dk0987654321]

what do the 2 halfs of the key do ?
do they unlock something
i dont no can any one help me plz

[vrunewise]

use one on another (loop and teath parts) and you'll get crystal key. Use this key to open a chest in Taverly, which contains one dragon stone and some amount of runes. The chest is located in a house just south of the north gate (on the road from Falador/Buthorpe)

[dk0987654321]

kk thnks i got d stone and 150 iron ore