Almost in line with the boezem canals, you find the nineteenth windmill. This mill, the ‘Blokkerse wip’ (official name: De Blokker) is a hollow post or 'wip' mill raised on a brick base. The exact date of construction is unknown, however, it is said that there was a hollow post mill at this location around 1500. There are two explanations for the origin of the Dutch name. The first is the term ‘wippen’ meaning wobble, which describes the movement of the mill when it is rotating quickly. The second is that the scoop wheel as it were 'wips' (scoops) the water from the polder into the high boezem.
Contrary to the other eighteen mills, this mill is not located within the precincts of Kinderdijk village, part of the Molenwaard, but in the adjacent Alblasserdam. Together with an auxiliary pump, it drained the Blokweer polder into the Nederwaard until 1956. During its restoration in 1975, the tiles, which had protected the substructure since 1875, were replaced with reed thatch. In 1997, the Blokker was damaged by fire, it was rebuilt to the original state in the following years. The substructure of the Blokker is now tiled. The wooden body is black. The cap is weatherboarded, meaning overlapping horizontal wooden boards. The Blokker's scoop wheel is installed outside the mill. The enormous cap (the body) weighs 30 tonnes.