Barton Marine Size 2 Double Stanchion Lead Blocks. Mounted onto the stanchion base the stanchion lead block enables the Genoa furling line to be led back to the cockpit for easy adjustment.Ball bearing sheaves have a precision molded acetal sheave running on a large diameter brass bearing ensuring free running under the highest of loads. The unit will fully rotate about the swivel head to match your pulling angle.Block attachment to stanchion is by means of screwing together the integral Stainless Steel strap. Specifications for Barton Marine Size 2 Double Stanchion Lead Block: Manufacturer: Barton Marine Color: Black Package Contents: Barton Marine Size 2 Double Stanchion Lead Block Barton Marine N02290: Size 2 Double Stanchion Lead Blocks