Description: Material: Oil pen Size: 13.8cm/5.43inch Color: Black/Red/Blue/White Feature: 1. Extra long pen tip: The pen tip is longer than a regular marker and can be used to mark deep holes or narrow spaces, making it suitable for use in deep holes such as pipelines and mechanical parts. 2. Strong durability material: The pen tip is made of wear-resistant and pressure resistant materials, which can maintain its shape and function after multiple uses, making it suitable for use on rough or hard surfaces. 3. High visibility ink: The ink color is bright, ensuring that the mark can be clearly visible even in deep holes or dark places. 4. Quick drying ink: The ink dries quickly, reducing the blurring or peeling of marks due to friction or contact, and is suitable for use in scenarios that require quick operation. 5. Wide applicability: Suitable for various material surfaces, suitable for use in industries, maintenance, construction, and other fields. Attention: 1.Due to manual measurement, there may be a 1-3mm error in product dimensions. 2.The color of the product may have errors due to objective reasons, and the actual product is the main focus. The product includes: 1 * deep hole long head marker pen