Ladd is the only US manufacturer of quality aperture discs & strips for electron microscopes, FIBs, satellites & others. Our clean, burr-free holes range from .1um & up, in a variety of materials. We also provide a wide-range of EM supplies, including nitrocellulose strips & solution, Mercox, coated grids, specialty adhesives conductive paints, Glutaraldehyde & crucibles.