API 3½ FH. The set offers seven files in iges format to choose from.Four files (pin), differing in configuration of the base of the pin:

• File PIN 3½ FH cone.igs - 3D model with a conical shape of the nipple base
• File PIN 3½ FH cyl.igs - 3D model with cylindrical shape of the nipple base
• File PIN 3½ FH narrow relief groove.igs - 3D model with a discharge groove width of ¾ inch (API recommendation)
• File PIN 3½ FH wide relief groove.igs - 3D model with a 1-inch wide discharge groove (API standard)Three files (box), differing in the shape of the relief elements:
• File BOX 3½ FH cone.igs - 3D model without relief elements
• File BOX 3½ FH boring.igs - 3D model with relief boring
• File BOX 3½ FH groove.igs - 3D model with relief groove