The Pentel 0.5mm Mechanical Pencil PD345 Side Clicker in Gray Color is a discontinued vintage drafting pencil made by the renowned brand Pentel in Japan. This pencil features a 0.5mm lead diameter, making it ideal for precise and detailed drawing and writing tasks. Its side-clicker design allows for easy and convenient lead replacement, making it a practical and efficient tool for professionals and enthusiasts alike. With its quality construction and unique design, this pencil is a must-have for collectors and users of drafting instruments.