The Edding 8891 refill leads are designed to complement the Edding Mechanical Carpenter Pencil, offering reliable and precise marking for a variety of construction tasks. Ideal for tough, rough surfaces such as wood, stone, concrete, and bricks, these rectangular leads are built to withstand the rigors of construction work. The rectangular shape prevents breakage and allows for easy sharpening with sandpaper or a hard stone. Available in sets of six, in HB hardness, these refill leads ensure you have the right tool for every marking need on site.