These hot dipped galvanized bolts are specially suited to work in harsh marine enviroments
this kit is commonly used to in heavy duty Boat Trailer bunk bracket holding 3 inch wide x 8 inch tall or 3 inch wide x 12 inch tall bunks.
 
this kit includes:
8 x 1/2 inch x 4 1/2 inch galvanized bolts
8 x 1/2 inch galvanized nuts 
8 x 1/2 inch galvanized lock washers