HARKEN 57mm Quad Carbo Block, 2631 Sailboat Blocks & Hardware_16 mm Classic Block - Swivel All-purpose (AP) blocks are a

All-purpose (AP) blocks are a great all-around solution

creating the necessary friction to hold the line securely

Perfect for traveler and cabintop controls or deck cleats—a must for Laser outhaul and cunningham controls

4” blade

while springs allow the block to articulate under load to keep the sheave properly aligned

HARKEN 57mm Quad Carbo Block, 2631 Sailboat Blocks & Hardware_16 mm Classic Block - Swivel All-purpose (AP) blocks are aLow friction 57mm Carbo Air Quadruple Block is lightweight, strong, reliable, and affordable. 30 percent lighter and 60 percent stronger than equivalent blocks. Sideplates are UV stabilized, high strength resin. Ball bearings are made from engineered plastic in fitted ball races. The 57mm Carbo Air blocks have an enormous working range that makes them ideal for main and jib sheets, spinnaker halyards, and control lines. This range handles loads