Harken Double Element Block w/Swivel & Becket 45mm. They are simultaneously contemporary and very robust. Elements 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 our previously least expensive blocks. Sideplates are hardcoat-anodized to resist corrosion. A tough composite bearing sheave resists corrosion for a long service life. Specifications for Harken 45mm Double Element Block w/Swivel & Becket: Manufacturer: Harken Color: Black Package Contents: Harken 45mm Double Element Block w/Swivel & Becket Harken 6239: Double Element Block w/Swivel & Becket 45mm