The lock bolt is made of galvanized steel.  The price is per piece.  It is a wood bolt with nut 603/555 M. A carriage bolt is a unique bolt that manages to achieve an extra strong fastening. This type has a smooth, round head with a thread and a nut on top. Lock bolts can only be loosened from the nut side, this is important to ensure optimal fastening in the long term.     
   The lock bolt is incl. nut.