Harken 45mm Single Aluminum Element Fiddle Block w/Swivel Becket & 150 Cam Cleat. 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. Specifications for Harken 45mm Single Aluminum Element Fiddle Block: Manufacturer: Harken Fabric/Material: Aluminum Package Contents: Harken 45mm Single Aluminum Element Fiddle Block Harken 6234: 45mm Single Aluminum Element Fiddle Block w/Swivel Becket & 150 Cam Cleat