Gray Ops CNC Magnum Brass Marker Black. Marks in rim of case across primer and on body of case. Use one or all 3 marker locations at the same time. Slotted design holds onto rim of case through the entire marking process for perfectly placed lines. Accepts any standard sharpie style marker and secure them at the correct height with the supplied thumb screws. Specifications for Gray Ops CNC Magnum Brass Marker: Manufacturer: Gray Ops CNC Color: Black Fabric/Material: 6061 Aluminum Package Contents: Gray Ops CNC Magnum Brass Marker Gray Ops CNC GO-BRMKRM: Magnum Brass Marker Black