Ref the anchor
It should hold Pal O Mine,I have no problem holding Great White on one.
Mine are made using ether solid Bar for the body or tube filled with lead to give them a bit more weight.
They do tend to be best used anchored straight into the rough, or the uptide end of a long wreck.
I usually rig mine with only a short length of chain as a rubbing end for the rope.
If you use your normal chain it sinks faster than the grapnel and can lasoo the wreckage
When motoring out if they are stuck your boat will easily straighten the wires. I then use a short length of tube to reset them like a fix nosed uptide lead.
I can take a photo of mine if you want to see how they are made,
I leave them with the wires in line with the body untill they are used as they are easier to stow.
But as someone else said they do rust, so I chuck a bit of paint on the new ones to slow that down a bit to prtect the boat
Charlie