ISC A-B Descender - Squeeze Style - WLL 300kg - Rope Dia 10.5 to 12.5mmISC A B Descender The A B Descender is a "squeeze style" device, designed for use in Technical Rope Access, Intervention Special Forces and is rated for two person loads. The A B Descender is fitted with an extended, spring loaded, flip down handle, which gives extra leverage, when a fine degree of descent control is required. The flip down handle is of particular use for extra control of a two person rescue load. Specification Rope diameter range