The MST Chang LRI Diamond Knife (Item #AK6175PC) is a purpose-built ophthalmic instrument in the Diamond Knives portfolio. provides superior visualization and reduces epithlium drag. Highest quality preset diamond blade. Fully retractable J-locking mechanism for blade and sharps protection. 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.