Sheaves mounted on self-lubricating bushings for good efficiency * Maximum allowable speed: 10 m/s * Accepts up to three carabiners to facilitate use * CE / UIAA certified. Efficiency: 71%. Breaking strength: 24 kN. Working load: 10 kN. Sheave: 21mm, self-lubricating bushings * For use with ropes of maximum diameter 13 mm. Weight 9.6 oz (195g)