DropOS

8Pcs/Set 20mm Deep Hole Long Nib Head Markers For Metal Perforating Pen Waterproof Bathroom Woodworking Decoration Multi-Purpose Features Versatile Combo Set 8 pro-grade markers in solid colors (Red/Blue/Black/Green) or custom mixes, perfect for high-frequency use, team workflows, or color-coded projects. ️ Deep Hole Specialist 20mm tungsten nib (0.78 inches) reaches 15mm deep holes – mark hidden joints, engine bay parts, or narrow gaps without disassembly, saving 50% time! ️ All-Weather Durability IPX5 waterproof ink resists rain and oil. Quick-dry formula (<3 sec) stays crisp on polished metal or greasy surfaces. ️ Military-Grade Build ABS shockproof body + anti-slip grip , survives -20℃~80℃ extremes. Nib lifespan: 100,000+ marks (3x longer than average). Universal Hard Surface Mastery Works on wood, concrete, tile, glass, plastic, and automotive parts. Precision <0.5mm for carpentry, metalwork, or DIY crafts. Specifications  ️ Product Name : DeepReach Pro Markers (8Pcs/Set) Dimensions : 13.7cm L (5.4in/0.45ft) • 30mm nib (1.1in) • 1.5cm diameter Color Options : Red/Blue/Black/Green ️ Material : ABS plastic + tungsten carbide nib Applications : Hardware Marking • Wood Marking • Tile Marking • Glass Marking • Automobile Manufacturing Marking • Perforation Positioning Product List Solid Color Set : /14/8/16/40 markers in Red/Blue/Black/Green Mixed Sets : 1/2/4/10 Red + 1/2/4/10 Blue +1/2/4/10 Black +1/2/4/10 Green Notice Size Tolerance : 1-2 cm manual measurement error possible. Color Variation : Actual colors may differ slightly due to lighting or screen displays. Real-World Use Case Auto Repair : Mark bolt specs inside 15mm engine holes with red ink – no disassembly needed! Custom Furniture : Blue markers stay put on angled surfaces (anti-slip grip) for precise mortise measurements.