IRA - 2N - 4N 1/8 1/4 32.0 4.8 19.1 6600(454) 3300(227) IRA - 2N - 6N 1/8 3/8 33.8 4.8 22.2 5300(365) 2600(179) IRA - 4N - 6N 1/4 3/8 38.1 7.1 22.2 IRA - 2N - 8N 1/8 1/2 40.1 4.8 26.9 IRA - 4N - 8N 1/4 1/2 44.7 7.1 26.9 4900(337) 2400(165) IRA - 6N - 8N 3/8 1/2 44.4 9.6 26.9 IRA - 4N -12N 1/4 3/4 47.0 7.1 33.3 IRA - 6N -12N 3/8 3/4 46.2 9.6 33.3 4600(316) 2300(158) IRA - 8N -12N 1/2 3/4 51.3 11.9 33.3 IRA - 4N -16N 1/4 1 49.8 7.1 41.2 IRA - 8N -16N 1/2 1 54.9 11.9 41.2 4400(303) 2200(151) IRA-12N -16N 3/4 1 55.1 15.7 41.2