Block features a light and strong hard black anodized and
teflon coated aluminum one-piece frame, resin sheaves with a
composite-fiber bearing and a high resistance stainless steel hub.
The sheave roates on a hollow pin with the line passing through the
pin's center, allowing for reduced line height off the deck and a
fixed line position and direction to the winch, even when the sheave
is articulated off-center.