Here's the Taper, Be careful... The nature of this rod makes the dimensions very, very critical. I hold my self to +.001 -.000 on finished half diameters. Flaming this rod makes a difference. Station Tip Butt 0 .078 .227 5 .088 .242 10 .108 .2495 15 .120 .258 20 .133 .2675 25 .1575 .278 30 .177 .290 35 .187 .300 40 .203 .300 45 .220 .300 48 .227 .300