Concrete Screws or Concrete Frame Screws are suitable for most masonry subtrates including concrete and brickwork and widely used for batten, window and door frame fixing. A through fixing that eliminates the need for marking and re-positioning. Specially designed self-tapping masonry fixing. Virtually stress free screws allowing close to edge applications. Torx compatible head screw for increased torque control. High load capacity with interlocking thread into base material. T30 Bit and Caps included in boxed product. Zinc Yellow Passivated finish.