The MST Thornton Fixation Ring, Closed (Item #AR0420) is a purpose-built ophthalmic instrument in the Fixation Rings & Picks portfolio. Designed around its specific working geometry, it features closed ring. 16mm diameter. Round handle. Fixed style. Overall length: 133mm. This combination of thoughtful design details and clearly defined specifications helps surgeons quickly identify the configuration that best fits their preferred technique and procedural needs.