Variable geometry handle and unique grip pattern of dominoes that prevent rope fray. Unlike anything else on the market, Lewmar's non-cam clutch has a series of smooth, in-line and parallel rings hinged at the base. The line is run through these rings which are then tilted by a single connecting lever. When tilted, the rings force the line to snake through them, creating the necessary friction to hold the line securely. Domino Cluster and greater surface area holds line under load without frayingControlled Release - Pull back handle combined with patented clutch and release mechanism provides controlled release even at full holding load.Solid link from handle to Domino ClusterLine size capability from 6mm (1/4 inch) to 14mm (9/16 inch)