This metal frame is not what holds Rain Degrey so tightly. It keeps her arms and legs in place but it is not what really binds her. The straps around her tits make them swell and turn purple. They will leave their own marks, but even those are not the real bondage. When SD straps her upside-down to a bench, the leather may be what keeps her from falling but it is not what keeps her in her place. The words from SD alone are enough to keep Rain right where she is, submissive and compliant.