Up to 14:1 holding power - highest available! Smooth easing of sheets . Fully Automatic, load sensing ratchet engagement Composite C-Cleat and fairlead Adjustable cleat arm position Easily fitted and securely retained Dyneema® link head1; Smooth Easing of sheets With auto models the sheet runds out smoothly and freely as soon as the ratchet mechnaism disengages.; When engaged, and with manual models, the sheave cross-hole geometry eliminates the 'shuddering' ease-out that you can expect from traditional v-groove ratchet blocks. ; High performance cleating Both Ronstan BB and RT Orbit Blocks™ feature strong, lightweight fibre-reinforced cleat arms. They have a wide range of adjustment and calibration marks, perfect for selecting your preferred cleating angle settings. The race-proven carbon-fibre reinforced Ronstan C-Cleat give secure rope holding with low entry and exit efforts, and are fitted with fairleads for fast action from any angle.