Abstract: A punch for punching rectangular holes in clamshell-shaped raceways for the mounting of receptacles allowing connection to appropriate cables running through the raceway. The punch includes a reciprocable punch having four generally triangular-shaped teeth projecting toward a die mounted in a die block. Each tooth is located at a corner of a rectangular-shaped cutting punch. The open raceway slides into the punching apparatus between the punch and the die to a stop pre-adjusted for hole location and the four teeth penetrate the wall of the raceway and the sloping cutting edges of the teeth cut the rectangular shape of the desired size.