Three-hole and four-hole strip apertures are commonly used in Hitachi, ISI/ABT/Topcon and JEOL instruments.

Standard and non-standard hole configurations can be supplied for most instruments.
Aperture strips with holes larger than 20 m are normally manufactured from molybdenum.

Strips with smaller holes are supplied in platinum/iridium alloy.
Due to the large variety of aperture strips in use, it is essential that the make and model of instrument, the size and number of holes and the overall dimensions are all specified at the time of order.