Features: *Deep-hole maker: the deep-hole carpenter pencil designed with extended and needle-nose tip of 45 mm in length, reaching hard-to-reach areas where other carpenter markers do not go, suitable for marking through holes or in other tight areas. *Built-in sharpener for marks: the pencil sharpener is screwed into the top of the mechanical drawing pencils, which won't get lost either and your mechanical pencil will be sharpened for nice precision. *Mechanical pencil: the carpenters pencil do not slip out of the fingers and repetitive tracings cause less pain; The pen clip design can be easily attached to the pocket, easy to use and not easy to lose, gaining in efficiency, proper for construction and bricklayers. *Marks on various surfaces: the solid carpenter pencil can draw on metal, plastic, glass, wood, paper, etc; The drafting pencil are reliable, which are grease to trace everywhere; Refills of 2 colors can distinguish marks with different meanings and can mark on dark surfaces. Specifications: Product name: Metal Carpenter Pencil Material: Metal Pen length: (Approx. ) 154mm Refill diameter: 2.8mm Optional Type: 01 ：Single Black Metal Pen 02 ：Single Blue Metal Pen 03 ：Black Pen + 1 Black Core + 1 Yellow Red Core 04 ：Blue Pen + 1 Black Core + 1 Yellow Red Core 05 ：Black Pen + Blue Pen + 3 Box Cores Suitable for: Draw on metal, plastic, glass, wood, paper, etc. Note: 1. Transition: 1cm=10mm=0.39inch. 2. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 3. Please allow slight manual measurement deviation for the data.