Abstract: An electric knife has two mutually reciprocating cutting blades and an adjustably spaced guide blade. The guide blade is mounted on a cylindrical cap that slidably encloses a cylindrical sleeve fixed to the knife handle, and is rotatable about an axis defined by a threaded rod perpendicular to the planes of the blades and coaxial with the cap and sleeve. A knurled nut on the threaded rod holds the cylindrical cap against a coil compression spring which also acts as a torsion spring urging the guide blade downwardly relative to the cutting blades against an abutment that also serves as a gauge for the thickness of the slices to be cut, manipulation of this knurled nut effecting this adjustment.