John Wesley on 1 Samuel 17:7

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.