they calculate shipping after you buy and they base it on fedex charges. Maybe the total you had was for the bolts? sorry you had the problem not sure why it happened. I would not want to see shipping that high. Here are their shipping rules;
"Shipping & Returns
All shipping charges are calculated upon completion of order. Shipping is paid by the customer and is based on actual FedEx shipping charges from our zip code 90014. Each packaged bolt weighs about 5 pounds. FedEx.com provides shipping estimates from our warehouse to you.
A 5% surcharge will be applied to all International orders."