The XS Scuba Flat Surface Spanner Wrench can work with multiple model regulators with it's adjustable range of {0.25 in | 6.35 mm} to {2.5 in | 63.5 mm}. It's most commonly used for the removal and installation of the high pressure seat retainer on first stages. It features a pin height of {0.15 in | 3.81 mm} and a pin diameter of {0.07 in | 1.78 mm} and fits most manufacturer’s first stages.