Built by the German Armed Forces in World War Two, this battery was armed with four 17 cm SKL4 guns with a range of just under 20 km.
According to http://www.bunkerpictures.nl/datasheets/holland/datasheet-ijmuiden-bpt81.html this battery has the following concrete emplacements:
4x M270 Embrasured emplacement.
1x M178 Fire control post for medium and heavy batteries.
2x 134 Ammunition bunker I.
2x Gun emplacement for a 17cm SKL/40.
1x Flak 38 2cm emplacement, with personnel room.
2x Küver 451a group bunker for 18 men.
1x Küver 451b group bunker for 18 men.
1x Fla24a Emplacement for a anti-aircraft gun with crew shelter.
3x Vf building.
1x Fa shelter.