Bob is right Shoo. 2.75 inches in diamiter. War heads were 10 and 17 pounders. The nails were tricky and couldn't be fired from tree top. You needed a little altitude for the shot gun blasts to work properly. Me and Bo took one apart one time just to see what it looked like. Had thousands of small nails packed row after row. Encased in a red powder. It was a visual aid for the pilot. Damn awesome toy. Touch