To set a Code 0 sail, a particularly high halyard or luff tension is required, with which the usual halyard swivels and stoppers are often overloaded. A 2:1 tack should therefore be made in the masthead with a special halyard swivel and a block at the top swivel. Note: The block will be delivered in black from now on. Block for sheave-Ø rope-Ø max. working load L1 L2 W D CX15 30mm 10mm 1500kg 66mm 21mm 13mm 8mm CX25 40mm 12mm 2500kg 83mm 26mm 18mm 10mm CX45 50mm 16mm 4000kg 104mm 31mm 24mm 12mm