Contra angle handpieces are motor-driven dental handpieces used with rotary instruments for cavity preparation, finishing, polishing, crown adjustment, denture adjustment, and other routine dental procedures. This category includes common ratios such as 1:1, 1:5, and 20:1, with options such as fiber optic or non-optic design, internal or external spray, push-button chuck, and E-type motor connection. Models may vary by speed ratio, bur compatibility, head size, cooling method, and included accessories.