The six refill leads are suitable for the 4K5 deep hole markers DHM and many other mechanical pencils. Two red, two yellow, and two black leads are included, ideal for precise marking, tracing, and writing on light and dark surfaces. Different colors are also useful for making markings with different meanings, thereby improving clarity.Special features6 refill leads for precise marking on light and dark surfacesSuitable for the 4K5 deep hole marker DHM and many other mechanical pencilsDifferent colors are ideal for markings with different meaningsStandard delivery6 refill leads box