HARKEN 6mm "D" Shackle, 2108 Top-Down Furling Accessories_Head Swivels mount a Ratchamatic block on

mount a Ratchamatic block on the boom above a cockpit-mounted switchable ratchet to allow the mainsheet to run freely in light air and to double hold power in heavy air

T2 doubles feature composite line guides that are integrated into the block head

The 16 mm is Harken’s smallest block

Commonly 57mm blocks are for jibsheets and spinnakers on medium-sized dinghies

HARKEN 6mm "D" Shackle, 2108 Top-Down Furling Accessories_Head Swivels mount a Ratchamatic block onForged stainless steel shackles are polished to a high luster and are stamped with the screw pin diameter. Twist shackles are forged with a 90 degree twist so the two attachment points can be perpendicular without torquing.