They are of the 4.60 clutching family, but in a braking version. As well as the bending spring, the armature can have a core to make it easier to fit on the shaft on which it is to be braked. The following table shows the sizes available with the corresponding torques of the series 4.62 / 4.63 / 4.64 brakes. . More technical information is available by downloading the product's datasheet.