Deep Hole Construction Pencil | Adp2 Site holster Built-in sharpener Interchangeable leads Tracer Deep Hole Construction Marking Pencil With Site Holster | Adp2 This versatile deep hole pencil from the brand TRACER® is the only pencil you will need as a professional or a do-it-yourselfer. Thanks to the unique 120 mm retractable and interchangeable leads, you can mark any narrow and deep holes. Maximum precision is guaranteed by the built-in sharpener in site holster. The pencil can be ejected by a single press. It's always to hand thanks to the site holster which is equipped with a clip as well. Can mark holes up to a depth of 145 mm in a 6 mm hole