PROFURL models	Application
Boat length*	Maximum forestay diameter	Classic	Cruising	Racing
6 to 8.50 m (19 to 28 ft)	6 mm (1/4'')	R 250	X	X
7.50 to 9,50 m (24 to 34 ft)	8 mm (5/16'')	NC 32	X
8.50 to 10 m (28 to 36 ft)	8 mm (5/16'')	LC 32	X
9 to 11 m (30 to 36 ft)	8 mm (5/16'')	C 32	X	X
9 to 11 m (30 to 36 ft)	8 mm (5/16'')	R 350		X
11 to 14 m (37 to 42 ft)	10 mm (3/8'')	NC 42	X
12 to 15 m (40 to 50 ft)	12 mm (1/2'')	LC 42	X
10 to 13 m (32 to 41 ft)	10 mm (3/8'')	R 420		X
11 to 16 m (37 to 53 ft)	12 mm (1/2'')	LC 42 S	X
15 to 22 m (50 to 66 ft)	16 mm (5/8'')	N 52	X
16 to 25 m (53 to 82 ft)	19 mm (3/4'')	L 52	X
* given for average displacement monohulls For multihulls and heavy displacement boats or staysails please refer to forestay diameter.

Note : you should never undersize a reefing system. A system should be more likely selected in the middle of the range of use, forestay diameters shown here are maximum dimensions.