Standard 10mm diameter shank. Should be used in hammer only model The poles driver simplifies this process of driving standard circuit ground poles into soft soil without the need for a large hammer or hydraulic hoses Easily drives 5/8 inch & 3/4 inch rods into the ground with ground rod driver for hammer drill Using a proprietary heat-treatments process and a unibodys designs, our bits exceptionally hardness to endure frequent use without easily breaking This highly specialization tool is widely used in industrial settings for driving grounding rods, threaded steel. Great for tasks like installing fence poles, rebars, parking bumper stakes, and electric fence posts, Manufacturer: BOYANDM