Designed to retrofit all battery-powered trimmer and battery-powered KombiSystem harnesses, this harness kit works with a belt adapter for attaching the support cushions for FSA and BGA to the AR backpack batteries’ carrying system and hip belt of the AR backpack batteries. This is a required component when using an approved metal cutting attachment that helps to reduce the risk of injury from loss of control and contact with the cutting attachment. Visit us to determine what components and accessories will help you get the most out of your STIHL tools.