Light alloy single pulley with mobile plates and ball bearings for lighter weight applications. For use with ropes up to 12mm and accommodate up to two carabiners on the upper eyelet. Suited for hauling and rescue. 4151211 Rope Diameter 1/2" | 12 mm MBS 4493 lbs | 20 kN Weight 0.25 lbs | 115 g Standards EN12278,UIAA