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Extension rods are manufactured using high-quality hollow drill steels. They are available in two primary shapes: Round and Hexagonal. The central hollow hole, known as the flushing hole, is essential for transmitting water or air during the drilling process to clear debris.
Technical Specifications Overview:
| Rod Cross Section | Length (mm) | Length (ft) | Thread Left | Thread Right |
|---|---|---|---|---|
| HEX 22 | 610 | 2' | R22 | R22 |
| HEX 22 | 915 | 3' | R22 | R22 |
| HEX 22 | 1220 | 4' | R22 | R22 |
| HEX 22 | 1525 | 5' | R22 | R22 |
| HEX 25 | 1000 | 3' 3" | R25 | R25 |
| HEX 25 | 1830 | 6' | R25 | R25 |
| HEX 25 | 3050 | 10' | R25 | R25 |
| HEX 28 | 1220 | 4' | R28 | R28 |
| HEX 28 | 1525 | 5' | R28 | R28 |
| HEX 28 | 3050 | 10' | R28 | R28 |