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| 1/2inch，Needle length12.7MM | 1inch，Needle length25.4MM | 1.5inch，Needle length38.1MM | the inside diameter of（MM) | Outer diameter(MM) |
| 12G1/2 | 12G1" | 12G1.5" | 2.4 | 2.76 |
| 13G1/2 | 13G1" | 13G1.5" | 1.99 | 2.41 |
| 14G1/2 | 14G1" | 14G1.5" | 1.55 | 1.84 |
| 15G1/2 | 15G1" | 15G1.5" | 1.36 | 1.84 |
| 16G1/2 | 16G1" | 16G1.5" | 1.2 | 1.64 |
| 17G1/2 | 17G1" | 17G1.5" | 1.12 | 1.48 |
| 18G1/2 | 18G1" | 18G1.5" | 0.84 | 1.27 |
| 19G1/2 | 19G1" | 19G1.5" | 0.7 | 1.05 |
| 20G1/2 | 20G1" | 20G1.5" | 0.6 | 0.91 |