When procuring heavy-duty drilling equipment like the Hunan Mega Drill series, you must prioritize torque capacity (kNm) and maximum drilling depth. Ensure the rig features a high-performance hydraulic system (preferably using Rexroth or Kawasaki components) to guarantee operational stability. For geological versatility, verify if the unit supports multiple drilling modes such as rotary, CFA, or displacement drilling. Additionally, check for Tier 3 or Tier 4 engine compliance to meet international emission standards.