From the first picture, it doesn't look like it has any way to mount onto a longer piece; which it would need to be a functional lance. So, unfortunately, I'm betting on a piece of fencing. Not sure where you're from, but I suppose you could tell people who don't know any better that it is the head of an old whaling lance from Nantucket. By the way, welcome to T-net!
thank you everyone for the warm welcome. It's about 2 1/2 feet long, maybe three. Been mudlarking about 6 months and had a few 'nice' finds but this is probably my most interesting. Will be spending a lot more time on here!
At first glance it looked to me like a large drill bit. But now I'm thinking that it could literally be anything ... You can hope that it's old anyways .. nice find !