The MST Donnenfeld Preset LRI, 550 Micron (Item #AK6175SPT550) is a purpose-built ophthalmic instrument in the Diamond Knives portfolio. Designed around its specific working geometry, it features lancet blade with 550 micron depth preset. Please note that custom preset options are available. These short-handled preset Donnenfeld lancet blades are available in various desired preset specifications. Blades are at a 15-degree angle for better applanation, are 1.0mm in width, and have a winged footplate for superior control. Handle is 100% titanium and measures 2.625 inches long. 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.