Old sash counterweight, was used to slide a sash window open upwards, the counterweight ensured that it stayed balanced and that the window would remain open in various positions. The weight of the counterweight is therefore quite heavy at 4.5 kg. Length 50 cm A plumb bob/plummet or plumb line is a tool to check if a plane or line is vertical, or to see if a point is perpendicularly above or below another point. A plumb bob consists of a solid brass cylinder or Prism-shaped weight with a conical bottom. ... Length 10 cm http://nl.wikipedia.org/wiki/Schietlood Total weight of lot: 4753 grams, with packaging comes to more than 5 kg. Will shipped with track and trace.