Describe RELIABLE: Made with a 45mm extended tip, our markers have a sturdy construction that can withstand high impact and won't break easily. The pen tip is sturdy and reliable, ensuring accurate marking even with long-term use, and is not easy to break or fade. MULTIPURPOSE: This marker is perfect for marking locations on furniture, bookshelves or lamp bases during the drilling process. It is also suitable for industrial applications such as metal processing and deep hole machining in automotive manufacturing. The pen holder is equipped with a simple ruler to facilitate construction measurement. Refillable Design: Our markers feature a refillable design for longer writing endurance and more vibrant colors. Say goodbye to frequent replacements and enjoy clear, eye-catching markings every time you use them. HIGH QUALITY MATERIALS: Our markers are made from plastic and are built to last. It provides reliable performance on a variety of including metal, wood and glass. Various colors: black, red, blue, white and other colors are available to meet your preferences and needs. Whether you're marking on a light or dark , our markers deliver clear, vibrant color for maximum visibility. Product details: Name: 45mm refillable long-head deep hole marker Material: plastic Color: black, red, blue Width: 0.7-1.0mm Size: pen body 154mm, pen tip length 45mm Package Included: 1 x deep hole extended marker pen