Material is 4.750 outside diameter and 0.375 wall thickness 6061-t6 aluminum alloy tube, per ww-t-700/6; anodized finish, coating thickness 0.002 to 0.003 diametrical buildup; apply solid film lubricant per mil-l-8937 all surfaces after anodizing; diameter is 4.492 in. Min and 4.495 in. Max; inside diameter is 4.121 in. Min and 4.125in. Max