The MST Stainless Steel Gauge (Item #AR0121) is a purpose-built ophthalmic instrument in the Calipers, Gauges & Markers portfolio. Designed around its specific working geometry, it features made from stainless steel. 5 or 10 degree increments. Outside diameter 18mm.Inside diameter 12mm.Markings on top of instrument, 10-degree increments.Round handle.Overalll length: 114mm. 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.