Harness mounted openable aluminium ring. The Atoll is an aerospace grade aluminium ring to be mounted on the bridge of the Koala harness. It facilitates easy attachment of climbing systems to your harness. The Atoll is available in 2 sizes and are individually marked. Technical Information Size S: • External diameter: 51mm • Internal diameter: 27mm • Weight: 36gram • Static resistance: 25kN • Reference: RANI05BKA Size L: • External diameter: 70mm • Internal diameter: 45mm • Weight: 53gram • Static resistance: 25kN • Reference: RANI04FLA • Certification: as fixed part of the Koala harness