Knife edge scribers have a straight point at one end and a flat knife blade at the other and can range in length from 100-250mm (4-10″). The knife blade is used for marking lines on wood, plastic and other soft material.
They have several other names including ‘striking knives’, ‘scoring knives’, ‘layout knives’ and ‘marking knives’, although most of these will only feature the knife blade and not have a scriber point at the other end.