Schaefer's Blocks rely on a variety of sheaves designs and scorings. Schaefer
sheaves are design to be compatible with Schaefer products. There is
a risk of incompatibility or failure when using Schaefer sheaves in blocks
manufactued by anyone other than Schaefer Marine.
The Schaefer Aluminum Sheave configuration accommodates both line and
wire, providing a chafe-free surface for line while giving full support
wire to prevent flattening. Hardcoat Anodized 60601-T6 Aluminum offers
superior strength and corrosion resistance.