Mechanical Pencil: ~ The carpenter's pencil won't slip from your fingers, and repetitive tracing causes less pain; The pen clip design can be easily attached to your pocket, easy to use and hard to lose, increasing efficiency, suitable for construction and masonry Practical Deep Hole Marker: ~ The pencil lead design extends the life of carpenter's pencils. The deep hole marker is strong and unbreakable, and also easy to use. With this in mind, this carpenter's pencil set is suitable for carpenters, builders, DIY enthusiasts, or anyone who needs a durable pencil to mark a variety of surfaces. Deep Hole Marker: ~ The tip of the carpenter's pencil has been extended by 1.69, allowing the carpenter's pencil to also reach areas that are difficult to reach with other deep hole markers. This makes this drill hole marker suitable for marking holes or other narrow areas. Humanized Material: ~ The solid carpenter pens are made of metal and rubber, which brings you a comfortable and non-slip writing experience. A high-quality case protects your pen core from damage and relieves finger pressure when writing. Multiple Uses: ~ The deep hole markers can draw on metal, wood, glass, paper, the pencil cores are durable and stronger than hard leads; The yellow and red can be drawn on a dark surface where the gray lead is not drawn, and a perfect helper for your work.