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| Place of Origin | CHINA |
| Brand Name | ROSCHEN |
| Certification | ISO |
| Model Number | 4.25 inch |
4.25 in. Hollow Stem Augers
4.25 inch Hollow Stem Augers for soil sampling and groundwater monitoring
The minimum hollow stem auger sizes recommended for installation of 2-inch diameter casing is 4.25 inches; however, larger hollow stem auger sizes may be necessary. The Environmental Protection Agency recommends the inner diameter of the auger be 3 inches to 5 inches greater than the outer diameter of the casing.
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