Harken 80mm Single Element Block Mastbase w/Swivel. They are simultaneously contemporary and very robust. Element's design pairs the minimum amount of metal required to protect the sheave with a proven journal bearing. So size for size Element is priced significantly lower than their previously least expensive blocks. Sideplates are hardcoat-anodized to resist corrosion. A tough composite bearing sheave resists corrosion for a long service life. Package Contents: Harken 80mm Single Element Block Mastbase Harken 6221: 80mm Single Element Block Mastbase w/Swivel