| Bit size | Bit type | |
| Inch(in) | Metric( mm) | |
| 5 1/2 | 139.7 | S126W, S517 |
| 5 7/8 | 149.2 | S216, S537G, S547G |
| 6 | 152.4 | S117GW, S216, S517, S537, S547, S617GY, S637G |
| 6 1/4 | 158.8 | S127GW, S217, S517, S537, S547, S637 |
| 6 1/2 | 165.1 | S127GW, S217, S517, S537 |
| 6 3/4 | 171.5 | S117GW, S137GW, S537G |
| 7 1/2 | 190.5 | S127W, S217, S517, ST517, S527, ST527, ST537, S617 |
| 7 7/8 | 200.0 | S117GW, S437G, S517G, S527G, S537G, S547G, S547GY, S627G, S617GY, S637GY |
| 8 3/8 | 212.7 | S217, S517G, S547G |
| 8 1/2 | 215.9 | S127GW, ST127GW, S137W, S217, S247, ST437GK, ST447GK, ST517GK, ST527GK, ST537G, ST547G, S617G, S627G, S637G |
| 8 3/4 | 222.3 | S117GW, S437GK, ST517G, S537G, S627G |
| 9 1/2 | 241.3 | ST117GW, ST127GW, ST437G, ST517G, ST527G, ST537G, ST547G, S617G, S837G |
| 9 5/8 | 244.5 | ST437G, ST517G, S527G, ST537G, ST547G |
| 9 7/8 | 250.8 | S117GW, ST417GK, ST437G, ST517G, ST527G, ST537G, ST547G, S617G |
| 10 3/8 | 263.5 | S217G, ST517G, ST527G |
| 10 5/8 | 269.9 | S117GW, S127GW, S137GW, S217G, ST437G, ST517G, ST527G, ST537G, ST547G |
| 11 | 279.4 | S117GW, S517G, S537G |
| 11 5/8 | 295.3 | S117GW, S127GW, S137GW, S217G, ST417GK, ST517G, ST537G, ST547G, S617GY |
| 12 1/4 | 311.2 | ST117GW, S127GW, S137, ST417GK, ST437GK, ST517GK, ST527GK, ST537G, ST547G, ST617GY, S637G |
| 12 3/8 | 314.0 | S117GW, S127GW, S137, ST417GK, ST437GK, ST517GK, ST527GK, ST537G, ST547G, ST617GY, S637G |
| 12 15/32 | 316.5 | ST117GW, S127GW, S137, ST417GK, ST437GK, ST517GK, ST527GK, ST537G, ST547G, ST617GY, S637G |
| 13 1/8 | 333.4 | S127GW, ST537G, ST547G |
| 13 5/8 | 346.1 | S437GK, ST517G, S537G |
| 13 3/4 | 349.3 | S437GK, ST517G, S537G |
| 14 3/4 | 374.7 | S117GW, S127GW, S137G, ST517GK, ST527GK, S537G, S547G, S617GY |
| 15 1/2 | 393.7 | S117GW, S127GW, S217G, S517GK, S527GK, ST537G, S547G, ST617GY |
| 16 | 406.4 | S117GW, S127GW, S137G, S337G, ST517GK, ST527GK, ST537G, S547G, S637G |
| 17 1/2 | 444.5 | ST117GW, S127W, S137, ST437G, ST517G, ST527G, ST537G, ST547G, S617GY, S637G |
| 18 | 457.2 | ST547G |
| 18 1/2 | 469.9 | S547G |
| IADC | Recommendation | Applicable Formation | |
| WOB | RPM | ||
| 116 117 | 0.35~0.8 | 150~80 | Very soft formations with low compressive strength and high drillability, such as clay, mudstone, chalk, etc. |
| 126 127 | 0.35~0.9 | 150~70 | Soft formations with low compressive strength and high drillability, such as mudstone, gypsum, salt, soft shale, soft limestone, etc. |
| 136 137 | 0.35~1.0 | 120~60 | Soft to medium soft formations with low compressive strength and high drillability, such as medium soft shale, hard gypsum, medium soft limestone, medium soft sandstone, soft formation with harder interbed, etc. |
| 216 217 | 0.4~1.0 | 100~60 | Medium formations with high compressive strength, such as medium soft shale, hard gypsum, medium soft limestone, medium soft sandstone, soft formation with harder interbed, etc. |
| 246 247 | 0.4~1.0 | 80~50 | Medium hard formations with high compressive strength, such as abrasive shale, limestone, sandstone, dolomite, hard gypsum, marble, etc. |
| 437 447 | 0.35~0.9 | 150~70 | Very soft formations with low compressive strength and high drillability, such as clay, mudstone, chalk, gypsum, salt, soft shale, soft limestone, etc. |
| 517 527 | 0.35~1.0 | 140~60 | Soft formations with low compressive strength and high drillability, such as mudstone, gypsum, salt, soft shale, soft limestone, etc. |
| 537 547 | 0.45~1.0 | 120~50 | Soft to medium formations with low compressive strength, such as medium soft shale, medium soft limestone, medium soft sandstone, medium formation with harder and abrasiver interbed, etc. |
| 617 627 | 0.45~1.1 | 90~50 | Medium hard formations with high compressive strength, such as hard shale, limestone, sandstone, dolomite, etc. |
| 637 | 0.5~1.2 | 80~40 | Hard formations with high compressive strength, such as sandstone, limestone, dolomite, hard gypsum, marble, etc. |
