The contra-angle 1:1 handpiece is typically lightweight and ergonomically designed to provide comfort and control during procedures. A handpiece's gear ratio indicates its speed capabilities and what procedures the handpiece is suitable to perform. A contra-angle handpiece with a 1:1 ratio is low speed and will rotate a bur at a maximum of 40,000rpm (electric) or 20,000rpm (air driven). The contra-angle 1:1 handpiece is typically used for intraoral procedures that require precision and control, such as tooth preparation, crown and bridge work, and endodontic procedures.