Unibody Single Block with Shackle 25-13 UB | Garhauer
Made from a single sold block of Aluminum
www.garhauermarine.com
Over the years I have replaced all of the turning blocks at the base of our mast with various models of Garhauer blocks. They hold up well, Very well.
I have no personal or financial connection with the vendor, but do recommend them if you are replacing some of those OEM solid-axle blocks from the 80's.