This is a set of Czech made reproduction German WWII early style aluminum paratrooper helmet bolts with the straight slot on the bolt head (set of 4). They are well made and will be real good for fixing up an original or a reenactor helmet.  It is $4.50 to ship these items anywhere in the US, Canada, Australia, NZ and most of the rest of the world. Postage within Europe is $3.50.