29mm Carbo Air Block with SwivelLow-friction Carbo Air blocks are lightweight, strong, reliableand affordable. Companions to the popular Harken Black Magic block line, these small, compact blocks have very high working loads for safe, easy trimming.Specifications:Sheave: 29mm / 1-1/8inLength: 66mm / 2-5/8inWeight: 26g / .9ozShackle pin: 4mm / 5/32inMaximum line: 8mm / 5/16inMaximum working load: 150kg / 330lbBreaking load: 454kg / 1000lb