... . Standard: API 2. OD: 2 7/8", 3 1/8", 3 7/8", 4" 3. Length: 10 ft or 20 ft API Perforating ... , 18, 20 SPM2.Common shot phasing45°, 60°, 90°,120°,180°3.Length of gunSQ51601.252.253.254.25mSQ73891.31.551.82 ... .052.32.552.83.053.33.553.84.054.34.554.85.055.35.555 ... .8mSQ861.82.052.32.552.83.053.3mSQ1021141271.31.551.82.052.32.552.83.053.33.553.84.054.3mWe could ...