Wrenches

Wrenches are a Scrap Clicker 2 currency, added in 5.6 (07/12/2018), but had no use until 5.7 (07/26/18) and can be seen in the Tree Upgrades together with the Steel Beams.

They get unlocked with the first x100 Stars Tree Upgrade. The player gets one with every merge. After purchasing another x100 Stars upgrade, the production will get increased by another 0.1 with each merge.

After purchasing another upgrades, they can be spent at the Scrapyard v4, also called wrenchyard, which increases the brick production by 50% every level. The production is also shown there.