Mast base, deck side angles. Allows for direct attachment of blocks for halyards. Direct replacement on Tattoo 26. To update the 26M to this style of deck side angles, order part number 3433-1M4. Sold by the pair.
The pictured blocks are 3318-010, they are attached to the holes on the side angles and used to run halyards or any other line that comes down to the base of the mast.