Our 5.5m approx 1/2 cabin boat had a similar anchor to the item below ( B4 I lost it), the double shaft helps to ensure the anchor rolls in horizontally and tips of the anchor are well away from the V front of the boat when the electric winch pulls the anchor in.
Interested in buying a new anchor as per below but have not come across a supplier.
My replacement pick anchor with the prongs is not great in holding the boat against wind/waves. Other sand anchors do not have a wide V and/or only have a single shaft.
https://www.ebay.com.au/itm/392859151216