SR485R-H10 rotary drilling rig. According to the official website of Sany Group Co., Ltd., we learned that Sany’s largest rotary drilling rig model is the SR485R-H10 rotary drilling rig, with a maximum drilling diameter of 3.2 meters and a maximum drilling depth of 120/100 meters. Rotary excavator, also known as rotary drilling rig and pile driver, is a comprehensive drilling rig that can be used in a variety of formations and has the characteristics of fast hole formation, less pollution, and strong maneuverability.