TRACER Deep Hole Construction Pencil The perfect tool for Carpenters, Joiners, Kitchen Fitters and DIY enthusiasts alike. Thanks to its unique 120mm retractable, interchangeable leads, the TRACER deep hole pencil can mark through beams & joists with ease. Read more About the product Being able to reach depths of 100mm in a 3mm hole with the extendable and retractable lead or 145mm in a 6mm hole at standard length, the TRACER Deep Hole Construction Pencil can satisfy even working on the most awkward of jobs. The included leads provide the perfect versatility you need when writing and marking on different work surfaces such as wood, metal, tiles, plastic, and piping.