A power tool

A power tool 100 with a housing 102 and a motor mounted in the housing to rotate a cutting tool 104. The tool has a guide-post 108, 110 slidably mounted to the housing and a base 106 fixed to the guide-post(s). The tool has a plunge locking lever 120 mounted to the housing which is moveable between a locked position wherein the at least one guide post is fixed with respect to the housing and an unlocked position wherein the at least one guide post is slidable with respect to the housing, thereby adjusting the distance between the base and the housing wherein the plunge locking lever is biased to the locked position. The tool has a catch mechanism arranged to engage the plunge locking lever in the unlocked position. The catch mechanism is mechanically coupled to a release lever arranged to disengage the catch mechanism and release the plunge locking lever from the unlocked position. Also, a locking system for a power tool having the aforementioned plunge locking lever and catch mechanism. Also, a plunge base for a power tool having a tool mount, at least one guide-post, a base and the aforementioned locking lever and catch mechanism.