A6B - 38 x 8MM B/B ALLOY SHEAVE BOXPart # = A 6 Description = Stainless Steel Ball Bearings and Sheave Sheave Width (mm) = 8 Sheave Dia (mm) = 38 Clot Size (mm) = 52 X 15 Hole Centres (mm) = 65 Hole Size (mm) = 4 Weight (g) = 34 Aluminium Sheave Box Large Aluminium body sheave box. With an easy to remove axle pin, sheaves can be maintained or swapped very simply. The axle pin is held in place by the surface the box is mounted to. Ideal for installation into sailboat masts, but also