A tool for preparing and treating food, such as knife, large fork, ladle, chopping board, etc. According to the invention, the body of the device is able to cover at least partially at least two locking mechanisms when it is in its retracted position, the retracted position being exclusively anthorised when each locking mechanism able to be at least partially covered by the body of the device is locked. The biasing member is compressible to allow the outer member to move into a second position as the outer member is moved through an opening in the workpiece.