The 1561 holds blocks upright. The 1638 holds blocks upright and allows attachment of control blocks.
Toggles include 1/4" (6 mm) and 5/16" (8 mm) mainsheet block pins. They accept 57 mm and 75 mm Carbo doubles and triples, 75 mm Carbo singles, 3.00" Small Boat single, Fiddle, Mid-range blocks and 57 mm AirBlocks®.
To attach Carbo control blocks to the stand-up toggle, choose 1626, 1627 cars or 1638 toggles.