There are five 1 inch diameter bronze bolts made from an old bronze shaft which were used to hold on half torpedo shaped lead castings on my boat until I removed them and recast the lead so it could go inside the GRP fin.
The lengths are 21 1/2, 20 7/8, 19, 17 3/4 & 16 ins (545, 530, 483, 450, 407 mm). They have 1 inch Whitworth threads at each end with 1/4 ins thick washers, 3/4 ins thick nuts on 2 ins thread length.
I am asking £25 for each bolt, or £100 for all five
Buyer collects or they could be sent by post or parcel2go carrier at cost.