The nickel-plated brass Beaded Chain Extender for Chest Assemblies measuring 45″ (114.3 cm) in length comes in handy when testing big-size individuals (i.e. obese). This flexible chain is used with all models of pneumatic chest assemblies. Connects to beaded chains on pneumo assemblies thanks to locking links. Supplied with in a small plastic box with one (1) locking link (chain coupling).