item is tubular in shape;length 0.62 inches;nominal id ref 0.812 inches;wall thickness 0.0359 inches;gap along side 0.16 inches min;material,steel,carbon 1040 thru 1040,spec qq-s-700,heat treat,quench and temper hr 15n 74-77;protective finish,phosphate coating type z,class 3,spec mil-p-16232 general characteristics item description