1 Samuel 17:7

“And the staff of his spear was like a weaver’s beam, etc.] The wooden part of it, held in the hand; this for thickness was like the beam in the weaver’s loom, about which the warp, or else the web, is rolled; and it is conjectured that, in proportion to the stature of Goliath, his spear must be twenty six feet long, since Hector’s in Homer f355 was eleven cubits, or sixteen feet and a half: and his spear’s head weighed six hundred shekels of iron; the iron part of the spear, the point of it, which has its name in Hebrew from a flame of fire, because when brandished it looks shining and flaming; and being the weight of six hundred shekels, amounted to eighteen pounds and three quarters of…”

“staff of his spear--rather under five feet long, and capable of being used as a javelin (Sa1 19:10). It had an iron head. one bearing a shield--In consequence of their great size and weight, the Oriental warrior had a trusty and skilful friend, whose office it was to bear the large shield behind which he avoided the missile weapons of the enemy. He was covered, cap-a-pie, with defensive armor, while he had only two offensive weapons--a sword by his side and a spear in his hand.”

“Spear’s-head - literally, “the flame of his spear,” the metal part which flashed like a flame. Six hundred shekels - i. e., between seventeen and eighteen pounds avoirdupois. return to 'Top of Page'”

“Beam - On which the weavers fasten their web. It was like this for thickness. And though the whole weight of Goliath's armour may seem prodigious; yet it is not so much by far as one Athanatus did manage: of whom Pliny relates, That he saw him come into the theatre with arms weighing twelve thousand ounces. A shield - Probably for state: for he that was clad in brass, little needed a shield. 1 Kings (1 Samuel) 17:8”

“the staff: Sa2 21:19; Ch1 11:23, Ch1 20:5 1 Kings (1 Samuel) 17:8”