Ronstan Mast Chocks - Set of 6 Pieces
Ronstan's six-piece Dinghy Mast Chock set
includes one concave moulded nylon chock to site 2 1/8 in. (53mm)
diameter masts and five 3/8 in. (10mm) chocks.
Use them to change the position of the mast
from one point of sail to another and as the breeze and sea state