Elevate your precision with our Professional Mechanical Carpenter Pencils, featuring a 45mm deep hole marker for those hard-to-reach spots. The sturdy clip ensures you'll always have your marker handy on-site. Crafted with a quality marker marking tool, this set is designed to last and make your job easier. With compatibility across various surfaces, you can mark confidently, knowing your design patent-protected tools will deliver precision every time.Deep Hole Marker: Reach tight spaces effortlessly with our 45mm deep hole marker, ideal for professional construction, woodworking, and architecture. Quality Marker Marking Tool: Designed for durability, our markers stand up to the demands of the job site while providing clear markings on various surfaces. Design Patent: Our unique marker design ensures precision and accuracy, setting us apart from competitors. Marks on Various Surfaces: Suitable for marking on metal, plastic, wood, and paper, these markers are versatile and reliable. Sturdy Clip: Carry your markers conveniently with the durable clip, perfect for busy construction sites.