Pica deep hole marker Blue Special marker for deep holes that are hard to reach. The marker writes on almost anything except glass products. Pica 150/41 deep hole markers. Brand: Pica Colour: Blue Waterproof, alcohol-based ink. Quick-drying Can be used for 24 hours without replacing the cap Extended tip made of stainless steel specifically for deep holes The nib can be reversed several times for a second, third, fourth,... life Replace the nib by pushing back the telescopic tip with a brush, remove the nib and turn it 180°. Then put the nib back in and move the telescopic tip back up Convenient holder with special clip for perfect one-handed operation