Professional high-performance sharp that can also be used as a drafting tool. 3-tier taper that makes it easy to see lines and letters while writing. Guide pipe adjustment mechanism: Can be adjusted according to the thickness of the ruler. Adjustment Mechanism: The length of the lead is adjustable with one knock.Knock cover has a hardness display window. Adjustable lead sleeve length (0 mm – 5 mm). Adjustable amount of lead extended with each click (0.2 mm – 2.0 mm). Aluminum and brass construction. Knurled grip section. Lead grade indicator. Refillable eraser under the top button.