I Samuel 17:7

7 His spear shaft was like a weaver's rod, and its iron point weighed six hundred shekels. That is, about 15 pounds or about 6.9 kilograms His shield bearer went ahead of him.

7 The stem of his spear was as long as a cloth-worker's rod, and its head was made of six hundred shekels' weight of iron: and one went before him with his body-cover.