/Durable and Reliable/: Made with a 45mm extended tip, our markers have a sturdy construction that can withstand high impact and not break easily. The pen tip is strong and reliable, ensuring accurate marking even with long-term use, and is not easy to break or fade. /Multi-purpose Use/: This marker is perfect for marking locations on furniture, bookshelves or lamp holders during the drilling process. It is also suitable for industrial applications such as deep hole machining in metal processing and 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 MATERIAL/: Our markers are made of durable plastic, built to last. It delivers reliable performance on a variety of surfaces, including metal, wood and glass. /Multiple Colors/: Black, red, blue, white and other colors are available to meet your preferences and needs. Whether you/re marking on light or dark surfaces, our markers deliver clear, vivid color for maximum visibility. Name: 45mm refillable long head deep hole marker pen material: plastic Color: black, red, blue