Micrometer Diamond Knives designed for Eye Surgery Procedures such as Astigmatism Management, Radial Keratotomy, Limbal Relaxing Incisions, Kera Rings and Intacs Implantation. Angstrom Sharp Edges (Warning! Our Diamond Knives are Extremely Sharp!). Reusable and Resharpenable. Precision Micrometer Titanium Handles.