Unkown Fuse

[jeeeensy]

Can anyone help ID tyhis please,, many thanks in advance .

 

[jayteepee_1999]

Is that for a 20mm head? What size is it?

 

[spotter]

i know these from another site JTP theyre 20mm and have no other markings,,,they are described as being copper but i would think its more likely they are brass that has degraded with been in the ground