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Medium-Hard Dowdco Style "Model" D816
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- Model: D816
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| Model | IADC Code | Size Range (in) | Recommended WOB (lb/in. Diameter) | Recommended Rotary Speed (RPM) | Special Features/Usage |
| D316 | M-121 | 7 7/8, 8 1/2, 8 3/4 | 250-2500 | 60-350 | DGHMVW |
| D413 | M-131 | 6, 6 1/8, 6 1/4, 6 1/2, 6 3/4, 7 7/8, 8 1/2, 8 3/4 | 250-2500 | 60-350 | DGHMVW |
| D419 | M-122 | 6, 6 1/8, 6 1/4, 6 1/2, 6 3/4, 7 7/8, 8 1/2, 8 3/4 | 250-2500 | 60-350 | DGHMVW |
| D519 | M-123 | 6 3/4, 7 7/8, 8 1/2, 8 3/4, 9 7/8, 12 1/4 | 250-2500 | 60-350 | DGHMVW |
| D513 | M-132 | 4 3/4, 5 7/8, 6, 6 1/8, 6 1/4, 6 1/2, 6 3/4 | 250-3000 | 60-350 | DGHMVW |
| D516 | M-223 | 6, 6 1/8, 6 1/4, 6 1/2, 6 3/4, 7 7/8, 8 1/2, 8 3/4 | 250-3000 | 60-350 | DGHMVW |
| D613 | M-132 | 6, 6 1/8, 6 1/4, 6 1/2, 6 3/4 | 250-3000 | 60-350 | DGHMVW |
| D613 | M-232 | 7 7/8, 8 1/2, 8 3/4 | 250-3000 | 60-350 | DGHMVW |
| D619 | M-223 | 7 7/8, 8 1/2, 8 3/4, 9 7/8, 12 1/4 | 250-3000 | 60-350 | DGHMVW |
| D719 | M-223 | 7 7/8, 8 1/2, 8 3/4, 9 7/8, 12 1/4 | 250-3000 | 60-350 | DGHMVW |
| D413X | M-333 | 6", 6-1/8", 6-1/4", 6-1/2", 6-3/4" | 250-3000 | 60-350 | DGHMVW |
| D516 | M-223 | 7-7/8", 8-1/2", 8-3/4" | 250-3000 | 60-350 | DGHMVW |
| D609 | M-243 | 3-7/8", 4-1/8", 4-1/4", 4-1/2", 4-3/4", 6", 6-1/8", 6-1/2", 6-3/4" | 250-3000 | 60-350 | DGHMVW |
| D616 | M-233 | 6-1/8", 6-1/2", 6-3/4", 7-7/8", 8-1/2", 8-3/4", 9-7/8", 11", 12-1/4" | 250-3000 | 60-350 | DGHMVW |
| D709 | M-243 | 4-3/4", 6", 6-1/8", 6-1/2", 6-3/4" | 250-3000 | 60-350 | DGHMVW |
| D709 | M-343 | 6", 6-1/8", 6-1/2", 6-3/4", 7-7/8" | 250-3000 | 60-350 | DGHMVW |
| D713 | M-333 | 7-7/8", 8-1/2", 8-3/4", 9-7/8", 12-1/4" | 250-3000 | 60-350 | DGHMVW |
| D613X | M-433 | 6", 6-1/8", 6-1/2", 6-3/4" | 250 - 3500 | 60 - 350 | DGHMVW |
| D613X | M-433 | 7-7/8", 8-1/2", 8-3/4" | 250 - 4000 | 60 - 350 | DGHMVW |
| D616X | M-423 | 7-7/8", 8-1/2", 8-3/4", 9-7/8", 12-1/4" | 250 - 3500 | 60 - 350 | DGHMVW |
| D716X | M-322 | 7-7/8", 8-1/2", 8-3/4" | 250 - 3500 | 60 - 350 | DGHMVW |
| D809 | M-443 | 6", 6-1/8", 6-1/2", 6-3/4" | 250 - 3500 | 60 - 350 | DGHMVW |
| D813 | M-333 | 7-7/8", 8-1/2", 8-3/4", 9-7/8", 12-1/4" | 250 - 3500 | 60 - 350 | DGHMVW |
| D813X | M-333 | 7-7/8", 8-1/2", 8-3/4" | 250 - 3500 | 60 - 350 | DGHMVW |
| D816 | M-423 | 9-7/8", 11", 12-1/4" | 250 - 3500 | 60 - 350 | DGHMVW |
| D913 | M-333 | 7-7/8", 8-1/2", 8-3/4" | 250 - 3500 | 60 - 350 | DGHMVW |
| D916X | M-323 | 7-7/8", 8-1/2", 8-3/4" | 250 - 3500 | 60 - 350 | DGHMVW |
