With the six replacement ledes, you will be equipped for long-term sustainable use of deep hole markers (e.g., wolfcraft p/n 5215000). they have a diameter of ø 2.8 mm and a length of 120 mm. the package contains four gray universal leads for making well visible marks on light surfaces as well as two yellow universal leads for dark surfaces. upon finishing, you can easily remove the marks with a damp cloth or eraser. in the transparent protective case, you can transport the mines protected against breakage and keep them in an orderly manner.