The 3.00 in (76 mm) single block comes in high-load or low-load
configurations. High-load blocks feature Torlon® bearings and
forged
stainless steel shackles.
The wire version features Hardkote-anodized, Teflon®-impregnated
aluminum sheaves for strength and corrosion resistance.
Use for:
Main and jib sheets
Spinnaker halyards
Control lines