When sourcing surgical drills, performance and precision are paramount. You must evaluate the Motor Type, prioritizing brushless motors for higher torque, lower heat generation, and longer lifespans. Rotational Speed (RPM) and Torque must align with the specific surgery type; for example, orthopedic drills typically require high torque at lower speeds (0-1200 RPM), while neurosurgical drills require high speeds (up to 80,000 RPM). Additionally, ensure the device features stepless speed control and a noise level below 60dB to maintain a stable operating environment.