Fits 2" OD aluminum dock post, either thick wall or thin wall with a 1.725" ID or 1.790" ID Auger is perfect for a freestanding dock system to help anchor and stabilize Ideally suited for sand, clay, mud or small stone lake or river bottoms Made from a military grade composite so it will not break like some poor quality off-shore manufactured metal cast augers Made in the USA Fits 2" OD aluminum dock post with either thick wall or thin wall. 1.725 ID or 1.790 ID. Auger is perfect for a freestanding dock system to help anchor and stabilize. Ideally suited for sand, clay, mud or small stone lake or river bottoms. Made from a military grade composite so it will not break like some poor quality off-shore manufactured metal cast augers. Made in the USA