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Bolt kit: 20 Pce - 10 x 3/8" Bolts + 10 "J Nuts."
Found on SO SO MANY GM USA pre metric (aka around mid 80's) GM body construction.
Larger washer headed Bolts & J nuts were used on secure heavier areas like hood hinges, various frame parts like x members, lower inner fender and fender lower mounts.
Again its a bolt kit that GM car restorers will find more then usefull in larger body rebuilds.
10 bolts 3/8 x 16 x 1 inch
10 J nuts. 3/8 x 16