The Guardian and Sapphire cages are interchangeable. The Guardian is substantially more open with an internal cage diameter of 44mm compared with the 36mm Sapphire.
Because of the increased cage size, the pressure pad also needs to increase in size. Whereas the Sapphire pad is 35mm in length, the Guardian version is 55mm.

Because of the increased surface area, more pressure can be applied to the penis which then gives enough anti-pullout to brake the larger member.

The closing relationship between the cage and the backband is different to the Sapphire. Spacer caps are not required. Loosening the unit up is acheived by the removal of a spacer from beneath the padlock or using the extended cage clip which allows the cage to slide forward a further 3mm in relation to the standard setting. As with the Sapphire, 0.4mm thickness spacers are provided for very fine adjustments.