Apparently you gotta completely fill in every bit of your order to get the price? For the LOW LOW PRICE of ONLY $43.95 each! LOLYep, clinching nail ... mine are steel.....
Don't seem to be able to price them out on the web site - perhaps requires an account.
Searched Amazon for "clinch nail", found lots of the smooth big head ones, nothing like the ones I have.
Thanks all for the help, at least I have a source.