Harken Power3 - 57 mm Ratchamatic Block, Swivel - 3/8" Line, 500 Lb. Work Load - Standard Grip, Black 60mm Suitable for both petrol and

Suitable for both petrol and diesel fuels

grip range 3/8-1/2"

Width 5/8" (16 mm)

6 cm) Width

Harken Power3 - 57 mm Ratchamatic Block, Swivel - 3/8" Line, 500 Lb. Work Load - Standard Grip, Black 60mm Suitable for both petrol andThese unique load sensing blocks shift seamlessly between ratchet and light air modes with no switches involved. They roll freely in both directions under low loads, but automatically engage the ratchet assist under higher loads. Best of all, the ratchet engagement point is adjustable to suit your muscle power and sailing style. Features Perfect for main jib sheets and asymmetric spinnakers Adjustable ratchet engagement Free release under light load